DOC: update the pandas.DataFrame.apply docstring

Author: mdeboc

pandas/core/frame.py

@@ -4823,9 +4823,9 @@ def apply(self, func, axis=0, broadcast=None, raw=False, reduce=None,
 
         Objects passed to the function are Series objects whose index is
         either the DataFrame's index (``axis=0``) or the DataFrame's columns
-        (``axis=1``). If ``result_type is None``, the final return type is the
-        return type of the applied function. Otherwise, it depends on the
-        `result_type` argument.
+        (``axis=1``). If ``result_type is None``, the final return type is
+        inferred from the return type of the applied function. Otherwise, it
+        depends on the `result_type` argument.
 
         Parameters
         ----------