Update correct link for mvc diagram

mattnwa · web-flow · commit 11247abbbd21 · 2019-07-10T15:59:08.000-05:00
diff --git a/sites/en/workshop/diagrams.mw b/sites/en/workshop/diagrams.mw
@@ -2,7 +2,7 @@
 
 * MVC: http://github.com/alexch/mission/raw/master/mvc.png
 
-* MVC: https://www.railstutorial.org/book/demo_app#sec-mvc_in_action
+* MVC: https://www.railstutorial.org/book/toy_app#sec-exercises_mvc_in_action
 
 * REST:
 
