Clarify popout disposal in Dispose method

Added comment to clarify the purpose of disposing the popout.

Author: Proximitron

Content.Client/Shuttles/BUI/ShuttleConsoleBoundUserInterface.cs

@@ -79,7 +79,7 @@ protected override void Dispose(bool disposing)
         {
             if (_window != null)
                 _window.RadarClicked -= OnRadarClicked;
-            _window?.DisposePopOut();
+            _window?.DisposePopOut(); // Starlight: close the popout if exists
         }
     }