[docs] [issue18761] Fix internal doc references for the email package

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7a1534dba050 by Serhiy Storchaka in branch '3.3':
Issue #18761: Improved cross-references in email documentation.
http://hg.python.org/cpython/rev/7a1534dba050

New changeset 464eed5ddb2e by Serhiy Storchaka in branch 'default':
Issue #18761: Improved cross-references in email documentation.
http://hg.python.org/cpython/rev/464eed5ddb2e

New changeset 062533327ad2 by Serhiy Storchaka in branch '2.7':
Issue #18761: Improved cross-references in email documentation.
http://hg.python.org/cpython/rev/062533327ad2

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