[docs] [issue25930] Document that os.remove is semantically identical to os.unlink

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9f13322eba8e by Brett Cannon in branch '3.5':
Backport of fix for issue #25930
https://hg.python.org/cpython/rev/9f13322eba8e

New changeset e082519bc2c8 by Brett Cannon in branch 'default':
Merge for backport  of fix for issue #25930
https://hg.python.org/cpython/rev/e082519bc2c8

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