PEP 705: Clean up examples in Inheritance section (#3495)

Clean up examples in Inheritance section

peps/pep-0705.rst

@@ -312,20 +312,28 @@ Inheritance
 
 To avoid potential confusion, it is an error to have a read-only type extend a non-read-only type::
 
+    class BandAndAlbum(TypedDict):
+        band: str
+        album: ReadOnly[Album]
+
     class BandAlbumAndLabel(BandAndAlbum, readonly=True):  # Runtime error
         label: str
 
 
 It is also an error to have a type without ``other_keys`` specified extend a type with ``other_keys=Never``::
 
-    class NamedDict(TypedDict, readonly=True):
+    class Building(TypedDict, other_keys=Never):
         name: str
+        address: str
 
-    class Person(NamedDict):  # Runtime error
-        age: float
+    class Museum(Building):  # Runtime error
+        pass
 
 It is valid to have a non-read-only type extend a read-only one. The subclass will not be read-only, but any keys not redeclared in the subclass will remain read-only::
 
+    class NamedDict(TypedDict, readonly=True):
+        name: str
+
     class Album(NamedDict, TypedDict):
         year: int