[docs] [issue15369] pybench and test.pystone poorly documented

[Roundup Robot]

Roundup Robot added the comment:

New changeset 08a0b75904c6 by Victor Stinner in branch 'default':
Remove pybench microbenchmark
https://hg.python.org/cpython/rev/08a0b75904c6

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nosy: +python-dev

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<http://bugs.python.org/issue15369>
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