Update new-field.md (#16988)

* Update new-field.md

If you do not change the binding then editing the rating will not work.

* Update new-field.md

* Update new-field.md

* Update new-field.md

Co-authored-by: Rick Anderson <[email protected]>

Author: reidhaegele

aspnetcore/tutorials/first-mvc-app/new-field.md

@@ -125,7 +125,10 @@ dotnet ef database update
 ---
 <!-- End of VS tabs -->
 
-Run the app and verify you can create/edit/display movies with a `Rating` field. You should add the `Rating` field to the `Edit`, `Details`, and `Delete` view templates.
+Run the app and verify you can create, edit, and display movies with a `Rating` field. Update the app:
+
+* Add the `Rating` field to the `Edit`, `Details`, and `Delete` view templates.
+* Update the binding in the edit action method of the `MoviesController`.
 
 > [!div class="step-by-step"]
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