[docs] [issue9370] Add reader redirect from test package docs to unittest module

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Yeah, I think I wrote this issue based on the diff that added the new note at the top, rather than looking at the existing intro text that already references unittest and doctest.

No need to change anything after all.

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resolution:  -> invalid
status: open -> closed

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<http://bugs.python.org/issue9370>
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