[4.2.x] Refs #34140 -- Applied rst code-block to non-Python examples.

Thanks to J.V. Zammit, Paolo Melchiorre, and Mariusz Felisiak for
reviews.

Backport of 534ac48297 from main.

docs/ref/class-based-views/mixins-multiple-object.txt

@@ -18,9 +18,11 @@ Multiple object mixins
         path('objects/page<int:page>/', PaginatedView.as_view()),
 
     * Pass the page number via the ``page`` query-string parameter. For
-      example, a URL would look like this::
+      example, a URL would look like this:
 
-        /objects/?page=3
+      .. code-block:: text
+
+          /objects/?page=3
 
     These values and lists are 1-based, not 0-based, so the first page would be
     represented as page ``1``.
@@ -29,7 +31,9 @@ Multiple object mixins
     </topics/pagination>`.
 
     As a special case, you are also permitted to use ``last`` as a value for
-    ``page``::
+    ``page``:
+
+    .. code-block:: text
 
         /objects/?page=last