[docs] [issue19190] Improve cross-references in builtins documentation.

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


Removed file: http://bugs.python.org/file31989/refs.builtins.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19190>
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