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

[Sanchit Khurana]

Change by Sanchit Khurana <sanchitkhuranask at gmail.com>:


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pull_requests: +16848
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/17363

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