Use consistent and less verbose deprecation messages

Source/Engine/Engine/InputEvent.cs

@@ -28,7 +28,7 @@ namespace FlaxEngine
         /// <summary>
         /// Occurs when event is triggered (e.g. user pressed a key). Called before scripts update.
         /// </summary>
-        [System.Obsolete("Depreciated in 1.7, use Pressed Action.")]
+        [System.Obsolete("Use Pressed instead")]
         public event Action Triggered;
 
         /// <summary>