[issue41910] Document that object.__eq__ implements `a is b`

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


----------
pull_requests: +22565
pull_request: https://github.com/python/cpython/pull/23698

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41910>
_______________________________________