DOC: fix docstring for pandas.read_parquet
- [ ] closes #xxxx
- [ ] tests added / passed
- [X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

```
################################################################################
####################### Docstring (pandas.read_parquet)  #######################
################################################################################

Load a parquet object from the file path, returning a DataFrame.

.. versionadded 0.21.0

Parameters
----------
path : str
    File path.
engine : {'auto', 'pyarrow', 'fastparquet'}, default 'auto'
    Parquet library to use. If 'auto', then the option
    ``io.parquet.engine`` is used. The default ``io.parquet.engine``
    behavior is to try 'pyarrow', falling back to 'fastparquet' if
    'pyarrow' is unavailable.
columns : list, default=None
    If not None, only these columns will be read from the file.

    .. versionadded 0.21.1
**kwargs
    Any additional kwargs are passed to the engine.

Returns
-------
DataFrame
    A parquet file is returned as two-dimensional data structure with
    labeled axes.

See Also
--------
to_parquet : Write DataFrame to a parquet file.
read_csv : Read a comma-separated values (csv) file into DataFrame.

Examples
--------
>>> pd.read_parquet('data.parquet')  # doctest: +SKIP

################################################################################
################################## Validation ##################################
################################################################################

Docstring for "pandas.read_parquet" correct. :)
```