[docs] [issue24136] document PEP 448: unpacking generalization

[Jelle Zijlstra]

Jelle Zijlstra added the comment:

Here's what I found reviewing what needs to be done here:

- Neil's What's New patch apparently made it into the 3.5 release notes.
- moigagoo's two patches haven't been committed. The text of both looks ok to me, but the patches don't apply cleanly.

Other areas that still need updates:
- https://docs.python.org/3/reference/expressions.html#list-displays and the sections for set, dict, and tuple displays need to mention PEP 448-style syntax.

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nosy: +Jelle Zijlstra

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