TYPO: idxmax is maximum, not minimum

Confusing doc typo was momentarily confusing.

Author: gruen

pandas/core/series.py

@@ -1179,7 +1179,7 @@ def idxmax(self, axis=None, out=None, skipna=True):
 
         Returns
         -------
-        idxmax : Index of minimum of values
+        idxmax : Index of maximum of values
 
         Notes
         -----