[docs] [issue18589] cross-referencing doesn't work between the extending guide and c-api

[Roundup Robot]

Roundup Robot added the comment:

New changeset bb546f6d8ab4 by Antoine Pitrou in branch '2.7':
Issue #18589: fix hyperlinking of type slots (tp_*)
http://hg.python.org/cpython/rev/bb546f6d8ab4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18589>
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