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

[Tim Peters]

Tim Peters <tim at python.org> added the comment:

I don't know that the language needs to define this, but sticking to __lt__ was a wholly deliberate design decision for CPython.

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nosy: +tim.peters

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