[docs] [issue23677] Mention dict and set comps in library reference

[Cheryl Sabella]

Cheryl Sabella <cheryl.sabella at gmail.com> added the comment:

Assigning to @Mariatta for the CPython mentored sprint.

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assignee: docs at python -> Mariatta
nosy: +Mariatta, cheryl.sabella
stage: patch review -> needs patch
versions: +Python 3.7, Python 3.8 -Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23677>
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