[docs] couple things on the Dos and Donts page

[Darren Yin]

http://docs.python.org/howto/doanddont.html

Even in versions where it was accepted, it made the function execution
> slower, because the compiler could not be certain which names are local and
> which are global.


Even in versions where it was accepted, it made the function execution
slower, because the compiler could not be certain which names were local and
which were global.

Currently it mixes past and present tenses in a somewhat awkward manner.

One of the most awful question asked on the newsgroup is why this code:

One of the most awful questions asked on the newsgroup is why this code:
Because it used to just be non-grammatical.
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