[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 78cd00b799be36a35c9f5cc99ce3bcef31112a5f by Victor Stinner (Miss Islington (bot)) in branch '3.6':
bpo-31942: Document optional support of start and stop attributes in Sequence.index method (GH-4277) (#4811)
https://github.com/python/cpython/commit/78cd00b799be36a35c9f5cc99ce3bcef31112a5f


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