[docs] [issue18760] Fix internal doc references for the xml package

[Roundup Robot]

Roundup Robot added the comment:

New changeset a426e5c03d6e by Serhiy Storchaka in branch '3.3':
Issue #18760: Improved cross-references in the xml package.
http://hg.python.org/cpython/rev/a426e5c03d6e

New changeset 32b59d122989 by Serhiy Storchaka in branch 'default':
Issue #18760: Improved cross-references in the xml package.
http://hg.python.org/cpython/rev/32b59d122989

New changeset 9c66b9cb886b by Serhiy Storchaka in branch '2.7':
Issue #18760: Improved cross-references in the xml package.
http://hg.python.org/cpython/rev/9c66b9cb886b

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