[docs] [issue19047] Assorted weakref docs improvements

[Roundup Robot]

Roundup Robot added the comment:

New changeset caa16423b324 by Nick Coghlan in branch 'default':
Close #19047: weakref doc cleanups
http://hg.python.org/cpython/rev/caa16423b324

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nosy: +python-dev
resolution:  -> fixed
stage: needs patch -> committed/rejected
status: open -> closed

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