[ReST] Make return/returns keyword parametrizable

[G-nn-r]

ReST allows both :return: and :returns: as keywords for the return values of functions and methods (see here).

Currently, docconvert uses :returns: , although many projects use :return:. It would be great to have this parametrizable, e.g., in the config.

Workaround:

In docconvert/writer/rest.py (e.g., D:\envs\my-venv\Lib\site-packages\docconvert\writer\rest.py), change line 113 from:
header = self._field_token.format("returns")
to
header = self._field_token.format("return")
(Just omit the s.)

Thanks in advance 🙂