[3.10] [Enum] update member.member removal (GH-29608)

ethanfurman · web-flow · commit 65c089751b81 · 2021-11-17T23:38:56.000-08:00
Accessing one enum member from another originally raised an `AttributeError`, but became possible due to a performance boost implementation detail.  In 3.11 it will again raise an `AttributeError`.
diff --git a/Doc/library/enum.rst b/Doc/library/enum.rst
@@ -1152,7 +1152,7 @@ all-uppercase names for members)::
 
 .. note::
 
-   This behavior is deprecated and will be removed in 3.12.
+   This behavior is deprecated and will be removed in 3.11.
 
 .. versionchanged:: 3.5
 
