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

STINNER Victor victor.stinner@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/5ce0a2a100909104836f53a2c8823006ec4...

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