[ci skip] Use explicit module namespace in guide

The Engines guide used an inline namespace, `Blorgh::ApplicationController`, which caused problems for users using an
explicit module namespace because the `ApplicationController` inherited from wasn't fully qualified.
The controller qualification was fixed in 661479324d573d419d8e15a1ea257e01856084af.

This ditches the inline namespace and makes the example more consistent with others in the guide.

1 files changed, 3 insertions, 1 deletions

diff --git a/guides/source/engines.md b/guides/source/engines.md
index 5065aab6b7..84017d5e13 100644
--- a/guides/source/engines.md
+++ b/guides/source/engines.md
@@ -890,7 +890,9 @@ engine this would be done by changing
 `app/controllers/blorgh/application_controller.rb` to look like:
 
 ```ruby
-class Blorgh::ApplicationController < ::ApplicationController
+module Blorgh
+  class ApplicationController < ::ApplicationController
+  end
 end
 ```