DOC: Updated aggregate docstring

Author: gurukiran07

pandas/core/generic.py

@@ -5074,7 +5074,8 @@ def pipe(self, func, *args, **kwargs):
         {see_also}
         Notes
         -----
-        `agg` is an alias for `aggregate`. Use the alias.
+        - `agg` is an alias for `aggregate`. Use the alias.
+        - Some NumPy functions such as ``np.mean``, ``np.nanmean``, ``np.median`` etc. resolve to their corresponding internal cython function.
 
         A passed user-defined-function will be passed a Series for evaluation.
         {examples}"""