[docs] [issue35654] Remove 'guarantee' that sorting only relies on __lt__ from sorting howto

[Martijn Pieters]

Martijn Pieters <mj at python.org> added the comment:

Well, if this is indeed by design (and I missed the list.sort() reference) then I agree the HOWTO should not be changed!

I'd be happy to change this to asking for more explicit mentions in the docs for sorted, heapq and bisect that using only < (__lt__) is a deliberate choice.

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<https://bugs.python.org/issue35654>
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