remove todo note and add new todo note

Author: topper-123

pandas/core/arrays/datetimelike.py

@@ -752,15 +752,13 @@ def _unbox(self, other) -> np.int64 | np.datetime64 | np.timedelta64 | np.ndarra
 
     @ravel_compat
     def map(self, mapper, na_action=None):
-        # TODO(GH-23179): Add ExtensionArray.map
-        # Need to figure out if we want ExtensionArray.map first.
-        # If so, then we can refactor IndexOpsMixin._map_values to
-        # a standalone function and call from here..
-        # Else, just rewrite _map_infer_values to do the right thing.
         from pandas import Index
 
         idx = Index(self)
 
+        # TODO: GH51936: the code inside the try clause should either be removed
+        #  (considereded a bug) or be deprecated.
+        #  map should work elementwise, not array-wise.
         try:
             if na_action is not None:
                 raise ValueError("calling mapper directly only na_action=None")