[docs] [issue26511] Add link to id() built-in in comparison operator documentation for "is"

[Roundup Robot]

Roundup Robot added the comment:

New changeset f38b831cb6b9 by Raymond Hettinger in branch '3.5':
Issue #26511:  Reference the id() function in the 'is' and 'is not' docs
https://hg.python.org/cpython/rev/f38b831cb6b9

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nosy: +python-dev

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