DOC: Fix typo "numpy.ndarray.putmask" (#60731)

Should be "numpy.putmask"

Author: wjandrea

pandas/core/indexes/base.py

@@ -5348,7 +5348,7 @@ def putmask(self, mask, value) -> Index:
 
         See Also
         --------
-        numpy.ndarray.putmask : Changes elements of an array
+        numpy.putmask : Changes elements of an array
             based on conditional and input values.
 
         Examples