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

[Ezio Melotti]

Ezio Melotti added the comment:

Note that not all the targets should be converted to links.  They should be converted only if the link is useful, and usually redundant links are not necessary (e.g. if the same target is repeated several times in the same paragraph/section).

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