clarify docs

Author: Daniel OBrien

ldai/tracker.py

@@ -148,15 +148,15 @@ def get_track_data(self):
 
     def track_duration(self, duration: int) -> None:
         """
-        Track the duration of an AI operation.
+        Manually track the duration of an AI operation.
 
         :param duration: Duration in milliseconds.
         """
         self.ld_client.track('$ld:ai:duration:total', self.context, self.get_track_data(), duration)
 
     def track_duration_of(self, func):
         """
-        Track the duration of a function execution.
+        Automatically track the duration of an AI operation.
 
         :param func: Function to track.
         :return: Result of the tracked function.