For enum.bin, update versionadded directive from 3.10 to 3.11 (#144574)

Author: guoci

Doc/library/enum.rst

@@ -1053,7 +1053,7 @@ Utilities and Decorators
       >>> enum.bin(~10)   # ~10 is -11
       '0b1 0101'
 
-   .. versionadded:: 3.10
+   .. versionadded:: 3.11
 
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