fix: typo get timesteps docstring (#562)

src/libecalc/common/time_utils.py

@@ -71,7 +71,7 @@ def get_timestep_indices(self, timesteps: List[datetime]) -> Tuple[int, int]:
     def get_timesteps(self, timesteps: List[datetime]) -> List[datetime]:
         """
         Get all given timesteps that are within this period.
-        Returns empty list if no timesteps are outside period.
+        Returns empty list if all timesteps are outside period.
         """
         timesteps = [timestep for timestep in timesteps if self.__contains__(timestep)]