Fix validation error type `SA05` and check in CI
#### Problem description
In order to have a continuous check by the CI on validation error `SA05` (Reference name in `See Also` section does not need `pandas` prefix, use correct reference instead), fixing them in the code base enables the addition to the CI for automated testing in the future.

`SA05` has just 96 occurrences (see [overview of the errors](https://gist.github.com/198cfa552c727d71bd7360fda66fdbb4)), including:


method | file | file_line | github_link
-- | -- | -- | --
pandas.CategoricalDtype | pandas/core/dtypes/dtypes.py | 175.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/dtypes/dtypes.py#L175
pandas.Categorical | pandas/core/arrays/categorical.py | 215.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/arrays/categorical.py#L215
pandas.api.extensions.ExtensionDtype | pandas/core/dtypes/base.py | 148.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/dtypes/base.py#L148
pandas.DataFrame.dtypes | pandas/core/generic.py | 5462.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L5462
pandas.DataFrame.ftypes | pandas/core/generic.py | 5498.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L5498
pandas.DataFrame.values | pandas/core/generic.py | 5255.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L5255
pandas.DataFrame.get_values | pandas/core/generic.py | 5342.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L5342
pandas.DataFrame.memory_usage | pandas/core/frame.py | 2475.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py#L2475
pandas.DataFrame.empty | pandas/core/generic.py | 1849.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L1849
pandas.DataFrame.agg | pandas/core/frame.py | 6248.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py#L6248
pandas.DataFrame.aggregate | pandas/core/frame.py | 6248.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py#L6248
pandas.DataFrame.cov | pandas/core/frame.py | 7040.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py#L7040
pandas.DataFrame.eval | pandas/core/frame.py | 3082.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py#L3082
pandas.DataFrame.rename | pandas/util/_decorators.py | 3922.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/util/_decorators.py#L3922
pandas.DataFrame.append | pandas/core/frame.py | 6532.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py#L6532
pandas.DataFrame.plot.bar | pandas/plotting/_core.py | 3005.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/plotting/_core.py#L3005
pandas.DataFrame.plot.barh | pandas/plotting/_core.py | 3090.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/plotting/_core.py#L3090
pandas.DataFrame.plot.box | pandas/plotting/_core.py | 3170.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/plotting/_core.py#L3170
pandas.DataFrame.from_csv | pandas/core/frame.py | 1838.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py#L1838
pandas.DataFrame.to_gbq | pandas/core/frame.py | 1324.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py#L1324
pandas.DataFrame.style | pandas/core/frame.py | 730.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py#L730
pandas.cut | pandas/core/reshape/tile.py | 23.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/reshape/tile.py#L23
pandas.unique | pandas/core/algorithms.py | 278.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/algorithms.py#L278
pandas.to_numeric | pandas/core/tools/numeric.py | 14.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/tools/numeric.py#L14
pandas.to_datetime | pandas/core/tools/datetimes.py | 401.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/tools/datetimes.py#L401
pandas.date_range | pandas/core/indexes/datetimes.py | 1379.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/indexes/datetimes.py#L1379
pandas.eval | pandas/core/computation/eval.py | 156.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/computation/eval.py#L156
pandas.errors.DtypeWarning | pandas/errors/__init__.py | 38.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/errors/__init__.py#L38
pandas.api.types.is_number | pandas/core/dtypes/inference.py | 29.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/dtypes/inference.py#L29
pandas.core.groupby.GroupBy.pipe | pandas/core/groupby/groupby.py | 538.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/groupby.py#L538
... | ... | ... | ...
pandas.read_stata | pandas/util/_decorators.py | 171.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/util/_decorators.py#L171
pandas.tseries.frequencies.to_offset | pandas/tseries/frequencies.py | 59.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/tseries/frequencies.py#L59
pandas.Panel.values | pandas/core/generic.py | 5255.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L5255
pandas.Panel.dtypes | pandas/core/generic.py | 5462.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L5462
pandas.Panel.ftypes | pandas/core/generic.py | 5498.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L5498
pandas.Panel.rename | pandas/core/panel.py | 1251.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/panel.py#L1251
pandas.plotting.bootstrap_plot | pandas/plotting/_misc.py | 363.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/plotting/_misc.py#L363
pandas.plotting.radviz | pandas/plotting/_misc.py | 146.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/plotting/_misc.py#L146
pandas.core.resample.Resampler.apply | pandas/core/resample.py | 257.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L257
pandas.core.resample.Resampler.aggregate | pandas/core/resample.py | 257.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L257
pandas.core.resample.Resampler.pipe | pandas/core/resample.py | 189.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L189
pandas.core.resample.Resampler.backfill | pandas/core/resample.py | 492.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L492
pandas.core.resample.Resampler.bfill | pandas/core/resample.py | 492.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L492
pandas.core.resample.Resampler.fillna | pandas/core/resample.py | 596.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L596
pandas.core.resample.Resampler.count | pandas/core/resample.py | 865.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L865
pandas.core.resample.Resampler.mean | pandas/core/resample.py | 857.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L857
pandas.core.resample.Resampler.median | pandas/core/resample.py | 857.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L857
pandas.core.resample.Resampler.ohlc | pandas/core/resample.py | 857.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L857
pandas.core.resample.Resampler.size | pandas/core/resample.py | 815.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L815
pandas.core.resample.Resampler.sem | pandas/core/resample.py | 857.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/resample.py#L857
pandas.Series.__array__ | pandas/core/series.py | 670.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/series.py#L670
pandas.io.formats.style.Styler | pandas/io/formats/style.py | 55.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/io/formats/style.py#L55
pandas.core.window.Rolling.count | pandas/core/window.py | 1689.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/window.py#L1689
pandas.core.window.Rolling.aggregate | pandas/core/window.py | 1678.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/window.py#L1678
pandas.core.window.Rolling.quantile | pandas/core/window.py | 1783.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/window.py#L1783
pandas.core.window.Expanding.count | pandas/core/window.py | 1967.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/window.py#L1967
pandas.core.window.Expanding.aggregate | pandas/core/window.py | 1956.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/window.py#L1956
pandas.core.window.Expanding.quantile | pandas/core/window.py | 2056.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/window.py#L2056
pandas.Panel.empty | pandas/core/generic.py | 1849.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L1849
pandas.Panel.get_values | pandas/core/generic.py | 5342.0 | https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py#L5342

Todo:

* [ ]   get rid of the errors in the code base
* [ ]   update the `code_check.sh` script to take into account the `SS02` type of errors