#23040: Clarify treatment of encoding and errors when component is bytes.

Patch by Wojtek Ruszczewski.

--HG--
branch : 3.4
Merge: #23040: Clarify treatment of encoding and errors when component is bytes.
Remove the redundant second argument of versionadded directive.

The versionadded directive is already placed in the scope of the
HTTPStatus documentation.
#20069: Add tests for os.chown.

Patch by Vajrasky Kok.