[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__`

Cheryl Sabella report at bugs.python.org
Thu May 30 16:20:17 EDT 2019

Change by Cheryl Sabella <cheryl.sabella at gmail.com>:

resolution:  -> fixed
stage:  -> resolved
status: open -> closed

Python tracker <report at bugs.python.org>

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