[docs] [issue8753] Py_ReprEnter and Py_ReprLeave are undocumented

[Daniel Stutzbach]

New submission from Daniel Stutzbach <stutzbach at google.com>:

Attached is a patch to add documentation for Py_ReprEnter and Py_ReprLeave.  Assigning to docs at python for review.

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assignee: stutzbach -> docs at python
keywords: +needs review, patch
nosy: +docs at python
stage: needs patch -> patch review
Added file: http://bugs.python.org/file20054/repr.patch

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