[docs] [issue31942] Document that support of start and stop parameters in the Sequence's index() is optional

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:


New changeset 5ce0a2a100909104836f53a2c8823006ec46f8ad by Victor Stinner (Nitish Chandra) in branch 'master':
bpo-31942: Document optional support of start and stop attributes in Sequence.index method (#4277)
https://github.com/python/cpython/commit/5ce0a2a100909104836f53a2c8823006ec46f8ad


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<https://bugs.python.org/issue31942>
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