Fix incorrect type name in TypedDict extra_items assignment test (#2184)

* Fix incorrect type name in TypedDict extra_items assignment test

* Apply suggestion from @JelleZijlstra

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Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Author: azimsh3r

conformance/tests/typeddicts_extra_items.py

@@ -219,7 +219,7 @@ class MovieWithYear2(TypedDict, extra_items=int | None):
     year: int | None
 
 details3: MovieWithYear2 = {"name": "Kill Bill Vol. 1", "year": 2003}
-movie3: MovieBase2 = details3  # E:'year' is not required in 'Movie', but it is required in 'MovieWithYear2'
+movie3: MovieBase2 = details3  # E: 'year' is not required in 'MovieBase2', but it is required in 'MovieWithYear2'
 
 # > When ``extra_items`` is specified to be read-only on a TypedDict type, it is
 # > possible for an item to have a :term:`narrower <narrow>` type than the