[docs] [issue8753] Py_ReprEnter and Py_ReprLeave are undocumented

[Daniel Stutzbach]

Daniel Stutzbach <stutzbach at google.com> added the comment:

Good point.  My perspective is skewed by all of the time that I spend working on container types. :-)

How about if I change the first sentence to the following?

    Properly implementing :attr:`tp_repr` for container types requires
    special recursion handling.

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