Add UPDATE comments to perishable information

tutorials/rendering/compositor.rst

@@ -311,6 +311,9 @@ post processes have run.
 From our internal size we calculate our group size, see our local size in our
 template shader.
 
+.. UPDATE: Not supported yet. When structs are supported here, update this
+.. paragraph.
+
 We also populate our push constant so our shader knows our size.
 Godot does not support structs here **yet** so we use a
 ``PackedFloat32Array`` to store this data into. Note that we have

tutorials/rendering/multiple_resolutions.rst

@@ -467,6 +467,9 @@ Non-game application
   script's ``_ready()`` function. This prevents the user from resizing the application
   below a certain size, which could break the UI layout.
 
+.. UPDATE: Planned feature. When manually override the 2D scale factor is supported,
+.. update this note.
+
 .. note::
 
     Godot doesn't support manually overriding the 2D scale factor yet, so it is