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

[Thomi Richards]

Thomi Richards added the comment:

Attached patch for master branch.

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keywords: +patch
nosy: +thomir
Added file: http://bugs.python.org/file44568/issue_26511.patch

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<http://bugs.python.org/issue26511>
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