docs(api): docstring for load_waste_chute() (#14058)

Author: ecormany

api/src/opentrons/protocol_api/protocol_context.py

@@ -463,9 +463,14 @@ def load_trash_bin(self, location: DeckLocation) -> TrashBin:
     def load_waste_chute(
         self,
         *,
-        # TODO: Confirm official naming of "staging area slot".
         with_staging_area_slot_d4: bool = False,
     ) -> WasteChute:
+        """Load the waste chute on the deck.
+
+        The deck plate adapter for the waste chute can only go in slot D3. If you try to
+        load another item in slot D3 after loading the waste chute, or vice versa, the
+        API will raise an error.
+        """
         if with_staging_area_slot_d4:
             raise NotImplementedError(
                 "The waste chute staging area slot is not currently implemented."