[docs] [issue23957] Additional misspelled in documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset ef58fc2e7b06 by R David Murray in branch '3.4':
#23957: fix typo.
https://hg.python.org/cpython/rev/ef58fc2e7b06

New changeset 4286afa7b63e by R David Murray in branch 'default':
Merge: #23957: fix typo.
https://hg.python.org/cpython/rev/4286afa7b63e

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nosy: +python-dev

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