DOC: PR09 errors
#### Location of the documentation

- [x]  [/core/frame.py](https://github.com/pandas-dev/pandas/blob/master/pandas/core/frame.py)
- [x] [/core/generic.py](https://github.com/pandas-dev/pandas/blob/master/pandas/core/generic.py)
- [x] [/core/flags.py](https://github.com/pandas-dev/pandas/blob/master/pandas/core/flags.py)
- [x] [/core/series.py](https://github.com/pandas-dev/pandas/blob/master/pandas/core/series.py)
- [x] [/core/groupby/generic.py](https://github.com/pandas-dev/pandas/blob/master/pandas/core/groupby/generic.py)
- [x] [/core/computation/eval.py](https://github.com/pandas-dev/pandas/blob/master/pandas/core/computation/eval.py)
- [x] [/io/pytables.py](https://github.com/pandas-dev/pandas/blob/master/pandas/io/pytables.py)
- [x] [/io/pickle.py](https://github.com/pandas-dev/pandas/blob/master/pandas/io/pickle.py)
- [x] [/io/json/_json.py](https://github.com/pandas-dev/pandas/blob/master/pandas/io/json/_json.py)

#### Documentation problem

PR09 pandas docstring errors. `Parameter description should finish with "."`

#### Suggested fix for documentation

Add `.` at the end of the parameter descriptions.
