Merge pull request numpy#27443 from Ishankoradia/doc-version-update-for-mean-param

updated the version of mean param from the release notes (2.0.0)

Author: mattip

numpy/_core/fromnumeric.py

@@ -4185,7 +4185,7 @@ def var(a, axis=None, dtype=None, out=None, ddof=0, keepdims=np._NoValue, *,
         The axis for the calculation of the mean should be the same as used in
         the call to this var function.
 
-        .. versionadded:: 1.26.0
+        .. versionadded:: 2.0.0
 
     correction : {int, float}, optional
         Array API compatible name for the ``ddof`` parameter. Only one of them