[issue7186] Document specialness of __doc__, and possibly other "special" attributes

[Florent Xicluna]

Florent Xicluna <florent.xicluna at gmail.com> added the comment:

This is similar with #9438, about __debug__ being read-only.

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nosy: +flox
stage:  -> needs patch
versions: +Python 2.6, Python 2.7, Python 3.1, Python 3.2

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