[issue20255] Doc/about: update a bit

[R. David Murray]

R. David Murray added the comment:

It seems fine to me, if docs@ is no longer the best place to start. It might be better if the tracker link read "documentation bugs on the bug tracker".  Also, you could link to the devguide as well as core-mentorship.

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nosy: +r.david.murray

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<http://bugs.python.org/issue20255>
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