DOC: Correct inputs list in Series.get_value

The variable passed in is "label," not "index."  The input description now matches what we see in "set_value"

Author: gfyoung

pandas/core/series.py

@@ -951,7 +951,7 @@ def get_value(self, label, takeable=False):
 
         Parameters
         ----------
-        index : label
+        label : object
         takeable : interpret the index as indexers, default False
 
         Returns