[docs] [issue10461] Use with statement throughout the docs

[SilentGhost]

SilentGhost <michael.mischurow+bpo at gmail.com> added the comment:

Here is the patch for Docs/library/cmd.rst

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nosy: +SilentGhost
Added file: http://bugs.python.org/file19663/cmd.rst.diff

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<http://bugs.python.org/issue10461>
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