[issue20735] Documentation: remove stringprep deprecation mark in docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset de5d4a60ab95 by Georg Brandl in branch '3.3':
Closes #20735: remove erroneous deprecated marker from stringprep docs
http://hg.python.org/cpython/rev/de5d4a60ab95

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

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