[docs] [issue10299] Add index with links section for built-in functions

[Ezio Melotti]

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

The last 4 functions are "Non-essential Built-in Functions"[0] so I kept them at the end of the list to match the order they have in the page.

[0]: http://docs.python.org/library/functions.html#non-essential-built-in-functions

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