Specs clarification: Forbid ClassVar and Final within TypedDict body (#1890)

Author: InSyncWithFoo

docs/spec/class-compat.rst

@@ -89,6 +89,10 @@ annotated in ``__init__`` or other methods, rather than in the class::
       def __init__(self, content):
           self.content: T = content
 
+``ClassVar`` cannot be used as a qualifier for a :ref:`TypedDict <typeddict>`
+item or a :ref:`NamedTuple <namedtuple>` field. Such usage also generates
+an error at runtime.
+
 .. _`override`:
 
 ``@override``

docs/spec/qualifiers.rst

@@ -203,6 +203,10 @@ following should be allowed::
    Y: Final = "y"
    N = NamedTuple("N", [(X, int), (Y, int)])
 
+``Final`` cannot be used as a qualifier for a :ref:`TypedDict <typeddict>`
+item or a :ref:`NamedTuple <namedtuple>` field. Such usage also generates
+an error at runtime.
+
 .. _`annotated`:
 
 ``Annotated``