Fixed #22154 -- Added "Built-in" to some class-based views titles.

docs/ref/class-based-views/index.txt

@@ -1,6 +1,6 @@
-=====================
-Class-based views API
-=====================
+==============================
+Built-in Class-based views API
+==============================
 
 Class-based views API reference. For introductory material, see
 :doc:`/topics/class-based-views/index`.

docs/topics/class-based-views/generic-display.txt

@@ -1,8 +1,8 @@
 .. _Generic views:
 
-=========================
-Class-based generic views
-=========================
+==================================
+Built-in Class-based generic views
+==================================
 
 Writing Web applications can be monotonous, because we repeat certain patterns
 again and again. Django tries to take away some of that monotony at the model