fix E501 docstring for pandas core groupby median

Author: sukriti1

pandas/core/groupby/groupby.py

@@ -2341,7 +2341,8 @@ def median(self, numeric_only: bool = False) -> NDFrameT:
         See Also
         --------
         Series.groupby : Apply a function groupby to a Series.
-        DataFrame.groupby : Apply a function groupby to each row or column of a DataFrame.
+        DataFrame.groupby : Apply a function groupby to each row or column of a
+            DataFrame.
 
         Examples
         --------