[docs] [issue19342] Improve grp module docstrings

[Roundup Robot]

Roundup Robot added the comment:

New changeset e2b757baaef1 by Georg Brandl in branch '3.4':
Closes #19342: improve docstrings in grp module.
https://hg.python.org/cpython/rev/e2b757baaef1

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nosy: +python-dev
resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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<http://bugs.python.org/issue19342>
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