Capitalize first letter in sentence

Author: mikdiet

guides/source/routing.md

@@ -850,7 +850,7 @@ resources :user_permissions, controller: 'admin/user_permissions'
 
 This will route to the `Admin::UserPermissions` controller.
 
-NOTE: Only the directory notation is supported. specifying the
+NOTE: Only the directory notation is supported. Specifying the
 controller with ruby constant notation (eg. `:controller =>
 'Admin::UserPermissions'`) can lead to routing problems and results in
 a warning.