doc: restructured return defination of df.drop() method

Author: alia5gar

pandas/core/frame.py

@@ -5209,8 +5209,8 @@ def drop(
         Returns
         -------
         DataFrame or None
-            DataFrame without the removed index or column labels or
-            None if ``inplace=True``.
+            Returns DataFrame or None DataFrame with the specified 
+            index or column labels removed or None if inplace=True
 
         Raises
         ------