[docs] [issue28979] What's New entry on compact dict mentions "faster" implementation

[Roundup Robot]

Roundup Robot added the comment:

New changeset 181453f9a0c4 by Victor Stinner in branch '3.6':
Issue #28979: Fix What's New in Python 3.6, dict
https://hg.python.org/cpython/rev/181453f9a0c4

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nosy: +python-dev

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