Fixing an XML comment

Author: jmprieur

2. Web API now calls Microsoft Graph/TodoListService/Controllers/TodoListController.cs

@@ -36,7 +36,7 @@ public TodoListController(ITokenAcquisition tokenAcquisition)
         static readonly ConcurrentBag<TodoItem> TodoStore = new ConcurrentBag<TodoItem>();
 
         /// <summary>
-        /// /// The Web API will only accept tokens 1) for users, and
+        /// The Web API will only accept tokens 1) for users, and
         /// 2) having the access_as_user scope for this API
         /// </summary>
         static readonly string[] scopeRequiredByApi = new string[] { "access_as_user" };