[issue25941] Add 'How to Review a Patch' section to devguide

[Ezio Melotti]

Ezio Melotti added the comment:

+1 to the above message.

There are also a couple of things that should be corrected:
* bugtracker -> bug tracker
* If the patch makes codechanges to C codebase -> If the patch affects any C file

This could also be condensed a bit and merged with https://docs.python.org/devguide/patch.html#reviewing instead of creating a new page.

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stage:  -> patch review
type:  -> enhancement

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25941>
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