whatsnew-3.10: Mention PEP 647 in the Release highlights section. (GH-99853)

Mention PEP 647 in the Release highlights section.

Also re-ordered the list so it matches the order in the details sections below.
(cherry picked from commit d74a58872c)

Co-authored-by: Yilei "Dolee" Yang <yileiyang@google.com>
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Miss Islington (bot) 2022-11-29 12:41:05 -08:00 committed by GitHub
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@ -77,8 +77,9 @@ Interpreter improvements:
New typing features:
* :pep:`604`, Allow writing union types as X | Y
* :pep:`613`, Explicit Type Aliases
* :pep:`612`, Parameter Specification Variables
* :pep:`613`, Explicit Type Aliases
* :pep:`647`, User-Defined Type Guards
Important deprecations, removals or restrictions: