[docs] [issue11015] Bring test.support docs up to date

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

Following the python-dev discussion, attaching a patch for removing fcmp and replacing its uses with assertAlmostEqual when needed.

All tests pass and patchcheck is clean.

Please review before I commit.

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nosy: +terry.reedy
Added file: http://bugs.python.org/file20884/issue11015.py3k.remove_fcmp.1.patch

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