[docs] [issue9106] remove numbers from 3-.. level entries in docs toc

[anatoly techtonik]

anatoly techtonik <techtonik at gmail.com> added the comment:

> R. David Murray <rdmurray at bitdance.com> added the comment:
>
> -1

Why? Do you like wrapped menu entries three lines long?

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<http://bugs.python.org/issue9106>
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