[3.9] [doc] Leverage the fact that the actual types can now be indexed for typing (GH-22340) #22430
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This shows users that they can use the actual types. Using deprecated types is confusing.
This also prefers colections.abc.Sized instead of the alias typing.Sized. I guess the aliases were created to make it convenient to import all collections related types from the same place.
This should be backported to 3.9.
Automerge-Triggered-By: @gvanrossum
(cherry picked from commit d9ab95f)
Co-authored-by: Andre Delfino [email protected]