Missing ")" in comment (#3381)

aspnetcore/fundamentals/app-state.md

@@ -211,7 +211,7 @@ public class MyController : Controller
     public MyController(MyAppData myService)
     {
         // Do something with the service (read some data from it, 
-        // store it in a private field/property, etc.
+        // store it in a private field/property, etc.)
     }
 } 
 ```