DOC: corrupted function signatures on stable
#### Location of the documentation

Stable (v1.1.4) docs.
https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.to_parquet.html

#### Documentation problem

On stable (v1.1.4) there are corrupted function signatures in docs for these functions at least.
 - pandas.DataFrame.to_stata
 - pandas.DataFrame.to_feather
 - pandas.DataFrame.to_parquet

![image](https://user-images.githubusercontent.com/41443370/99090999-ded11800-2601-11eb-903c-f7e600a82716.png)

Instead of named arguments followed by kwargs there are only kwargs.

There is no such problem on dev docs.
For example, here https://pandas.pydata.org/docs/dev/reference/api/pandas.DataFrame.to_parquet.html?highlight=to_parquet#pandas.DataFrame.to_parquet

#### Suggested fix for documentation

I though that probably decorator ``deprecate_kwargs`` was causing problems (the functions concerned are decorated),
but there is no such problem on dev docs, so the reason is not clear to me.