[3.14] gh-119180: Document the `format` parameter in `typing.get_type_hints()` (GH...

[3.14] gh-119180: Document the `format` parameter in `typing.get_type_hints()` (GH-143758) (#148901)

Do not mention `__annotations__` dictionaries, as this is slightly
outdated since 3.14.

Rewrite the note about possible exceptions for clarity. Also do not
mention imported type aliases, as since 3.12 aliases with the `type`
statement do not suffer from this limitation anymore.
(cherry picked from commit 8bf99ae3a9f12d105a70d6fda93dddde4adeee8f)

Co-authored-by: Victorien <65306057+Viicos@users.noreply.github.com>