[docs] [issue30969] Docs should say that `x is z or x == z` is used for `x in y` in containers that do not implement `__contains__`

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset e8661c1dabc206bf7fe6e302e38fa426aa734dd0 by Miss Islington (bot) in branch '3.7':
bpo-30969: Fix docs about the comparison in absence of __contains__ (GH-2761)
https://github.com/python/cpython/commit/e8661c1dabc206bf7fe6e302e38fa426aa734dd0


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nosy: +miss-islington

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