[docs] [issue10488] Improve documentation for 'float' built-in.

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

I would prefer to keep the doc for float() simple, including what it accepts (numbers and strings) and a few examples like ``'1.2'``, ``'.5'``, ``' +3 '``, ``'inf'``, ``'NaN'``.
Even if the other information is still valuable, I'm not sure this is the best place where to include it, and I think it might be confusing for unexperienced users.

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<http://bugs.python.org/issue10488>
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