[docs] [issue15979] Improve timeit documentation

[Ezio Melotti]

Ezio Melotti added the comment:

The first example shows the basic usage and it's right at the beginning, all the other "advanced" examples are at the bottom.

About the autocalibration you are right, I'll rephrase the sentence (see also #6422).

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<http://bugs.python.org/issue15979>
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