Added missing return type hint and updated doc string

codecarbon/emissions_tracker.py

@@ -475,11 +475,11 @@ def start_task(self, task_name=None) -> None:
         )
         self._active_task = task_name
 
-    def stop_task(self, task_name: str = None) -> float:
+    def stop_task(self, task_name: str = None) -> EmissionsData:
         """
         Stop tracking a dedicated execution task. Delta energy is computed by task, to isolate its contribution to total
         emissions.
-        :return: None
+        :return: EmissionData for an execution task
         """
         task_name = task_name if task_name else self._active_task
         self._measure_power_and_energy()
@@ -495,6 +495,7 @@ def stop_task(self, task_name: str = None) -> float:
         self._tasks[task_name].emissions_data = task_emission_data
         self._tasks[task_name].is_active = False
         self._active_task = None
+
         return task_emission_data
 
     @suppress(Exception)