[docs] [issue13239] Remove <> operator from Grammar/Grammar

[Florent Xicluna]

Florent Xicluna <florent.xicluna at gmail.com> added the comment:

This is PEP 401.

"[Because] the != inequality operator ... was a horrible, finger pain inducing mistake, the FLUFL reinstates the <> diamond operator as the sole spelling. This change is important enough to be implemented for, and released in Python 3.1. To help transition to this feature, a new future statement, from __future__ import barry_as_FLUFL has been added."

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nosy: +flox
type:  -> behavior

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