Fixes the last code block

Author: RichardOtvos

guides/v2.7.0/applications/initializers.md

@@ -99,7 +99,7 @@ export default {
   after: ['configReader', 'websocketInit'],
   initialize: initialize
 };
-``
+```
 
 Note that ordering only applies to initializers of the same type (i.e. application or application instance).
 Application initializers will always run before application instance initializers.