[docs] [issue21063] Touch up one-line descriptions of modules for module index

[Angad Singh]

Angad Singh added the comment:

Interested in taking this up as my first patch -
@brett - are you only talking about the :synopsis: or the occurrence of "This module" at the beginning of the description as well?
-angad

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nosy: +angad

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21063>
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