[docs] [issue12479] Add HTTPErrorProcessor class definition

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

It seems to me that the doc after the patch is barely more helpful.  It does not explain when and how one would see or use the class, nor what it does.

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nosy: +eric.araujo

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<http://bugs.python.org/issue12479>
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