[docs] [issue19225] lack of PyExc_BufferError doc

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Sorry, but I just found that warning categories are enumerated near the documentation of PyErr_WarnEx(). I think that that enumeration is no longer needed and can be removed.

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<http://bugs.python.org/issue19225>
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