[docs] [issue18758] Fix internal references in the documentation

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thank you Georg for all your reviews.

Only patch for pickle left, and this is not trivial one.

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resolution:  -> fixed
stage: patch review -> committed/rejected

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18758>
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