[issue18983] Specify time unit for timeit CLI

[Julian Gindi]

Julian Gindi added the comment:

Just wanted to check in and see if the documentation change I made is sufficient. I tried to copy the other entries for the command line arguments. Let me know if I can improve it in any way.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18983>
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