[docs] [issue19189] Improve cross-references in pickle documentation.

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thank you Georg for your review and for your suggestion.

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resolution:  -> fixed
stage: patch review -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19189>
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