docs: extend docstrings

src/aura_engine/scheduling/programme.py

@@ -82,6 +82,9 @@ class TimetableService:
             1. Fetch the latest timeslots from the API or the API cache.
             2. Merge with the current timetable.
             3. Persist to `timetable.json`
+
+        Args:
+            fetcher (ApiFetcher): Service to fetch timeslots and playlists.
         """
         self.logger.debug("Trying to fetch new timeslots from API endpoints...")
         # Create a fetching thread and wait until it is done
@@ -297,6 +300,10 @@ class TimetableMerger:
         The start time of any timeslot acts as the key. The map value holds a dictionary, where
         the `local` key is the local timeslot, and the `remote` key holds the remote timeslot.
 
+        Args:
+            local_timeslots ([Timeslot]): The current timetable.
+            remote_timeslots ([Timeslot]): The latest timeslots from the API.
+
         Returns:
             ({str: {}}): Map with timestamp as key and a dictionary referencing timeslots.
         """