Implemented CR feedback

Assets/Prefabs/UI/JoinContent.prefab

   m_EditorClassIdentifier: 
   m_onVisibilityChange:
     m_PersistentCalls:
-      m_Calls: []
+      m_Calls:
+      - m_Target: {fileID: 1462126939442648229}
+        m_TargetAssemblyTypeName: LobbyRelaySample.UI.JoinMenuUI, LobbyRelaySample
+        m_MethodName: JoinMenuChangedVisibility
+        m_Mode: 0
+        m_Arguments:
+          m_ObjectArgument: {fileID: 0}
+          m_ObjectArgumentAssemblyTypeName: UnityEngine.Object, UnityEngine
+          m_IntArgument: 0
+          m_FloatArgument: 0
+          m_StringArgument: 
+          m_BoolArgument: 0
+        m_CallState: 2
   m_LobbyButtonPrefab: {fileID: 7018369548608736188, guid: f6d35a456ba76a24587dce83bd088b7d, type: 3}
   m_LobbyButtonParent: {fileID: 7824921818678239159}
 --- !u!114 &7550446569341709048

Assets/Scripts/UI/JoinMenuUI.cs

                 RemoveLobbyButton(m_LocalLobby[key]);
         }
 
-        private bool CanDisplay(LocalLobby lobby)
+        public void JoinMenuChangedVisibility(bool show)
-            return lobby.Data.State == LobbyState.Lobby && !lobby.Private;
+            if (show)
+                OnRefresh();
-        private void Awake()
+        private bool CanDisplay(LocalLobby lobby)
-            m_onVisibilityChange.AddListener(JoinMenuChangedVisibility);
-        }
-
-        private void JoinMenuChangedVisibility(bool show)
-        {
-            if (show)
-                OnRefresh();
+            return lobby.Data.State == LobbyState.Lobby && !lobby.Private;
         }
 
         /// <summary>

Assets/Scripts/UI/SpinnerUI.cs

                 errorTextVisibility.Show();
                 var errorString = new StringBuilder();
                 errorString.Append("Error");
-                var codeString = ": ";
+                errorString.Append(": ");
-                    codeString += observed.lastErrorCode;
-                
-                errorString.Append(codeString);
+                {
+                    errorString.Append(observed.lastErrorCode);
+                    errorString.Append(", ");
+                }
                 errorString.Append("Check Unity Console Log for Details.");
 
                 errorText.SetText(errorString.ToString());