Update the comment lines.

Author: cmard

com.unity.ml-agents/CHANGELOG.md

@@ -18,7 +18,7 @@ and this project adheres to
 
 #### com.unity.ml-agents / com.unity.ml-agents.extensions (C#)
 - Added the capacity to initialize behaviors from any checkpoint and not just the latest one (#5525)
-
+- Added the ability to get a read-only view of the stacked observations (#5523)
 #### ml-agents / ml-agents-envs / gym-unity (Python)
 - Set gym version in gym-unity to gym release 0.20.0
 - Added support for having `beta`, `epsilon`, and `learning rate` on separate schedules (affects only PPO and POCA). (#5538)

com.unity.ml-agents/Runtime/Sensors/StackingSensor.cs

@@ -288,9 +288,9 @@ public BuiltInSensorType GetBuiltInSensorType()
         }
 
         /// <summary>
-        /// Returns a read-only view of the observations that added.
+        /// Returns the stacked observations as a read-only collection.
         /// </summary>
-        /// <returns>A read-only view of the observations list.</returns>
+        /// <returns>The stacked observations as a read-only collection.</returns>
         internal ReadOnlyCollection<float> GetStackedObservations()
         {
             List<float> observations = new List<float>();