Fix typo in enum module documentation (GH-100992)

(cherry picked from commit 2161bbf)

Co-authored-by: Noam Cohen <[email protected]>

Author: miss-islington

Doc/library/enum.rst

@@ -819,7 +819,7 @@ Utilities and Decorators
    ``_generate_next_value_`` can be overridden to customize the values used by
    *auto*.
 
-   .. note:: in 3.13 the default ``"generate_next_value_`` will always return
+   .. note:: in 3.13 the default ``_generate_next_value_`` will always return
              the highest member value incremented by 1, and will fail if any
              member is an incompatible type.