[docs] [issue17955] Minor updates to Functional HOWTO

[A.M. Kuchling]

A.M. Kuchling added the comment:

Updated version of the patch:

* uses 'r' instead of 'N'.
* removes the old outline and some notes at the end.
* minor rewriting.

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Added file: http://bugs.python.org/file30257/functional.txt

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