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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

+1 from me on a table at the top of the functions page.
I am assuming that the markup will induce hotlinks.
The main problem I see is the need to hand rewrite when another function is added

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nosy: +terry.reedy

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<http://bugs.python.org/issue10299>
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