Explicitly mention static type checkers

Author: Bas van Beek

Doc/whatsnew/3.10.rst

@@ -149,8 +149,8 @@ types
 -----
 
 Reintroduced the :data:`types.EllipsisType`, :data:`types.NoneType`
-and :data:`types.NotImplementedType` classes, aforementioned types
-now being useable as annotations.
+and :data:`types.NotImplementedType` classes, providing a new set
+of types readily interpretable by type checkers.
 (Contributed by Bas van Beek in :issue:`41810`.)
 
 unittest

Misc/NEWS.d/next/Library/2020-09-20-15-14-05.bpo-41810.7l8lyV.rst

@@ -1,3 +1,3 @@
 :data:`types.EllipsisType`, :data:`types.NotImplementedType` and
-:data:`types.NoneType` have been reintroduced, aforementioned types
-now being useable as annotations.
+:data:`types.NoneType` have been reintroduced, providing a new set
+of types readily interpretable by static type checkers.