Update documentation to load custom code

Just like mentioned in commit 6552e3197d, we need to use `load` instead
of `require_dependency` since we started using zeitwerk.

docs/en/customization/components.md

@@ -3,7 +3,7 @@
 For components, customization can be used to change both the logic (included in a `.rb` file) and the view (included in a `.erb` file). If you only want to customize the logic for, let's say, the `Admin::TableActionsComponent`, create a file named `app/components/custom/admin/table_actions_component.rb` with the following content:
 
 ```ruby
-require_dependency Rails.root.join("app", "components", "admin", "table_actions_component").to_s
+load Rails.root.join("app", "components", "admin", "table_actions_component.rb")
 
 class Admin::TableActionsComponent
   # Your custom logic here
@@ -15,7 +15,7 @@ If, on the other hand, you also want to customize the view, you need a small mod
 ```ruby
 class Admin::TableActionsComponent < ApplicationComponent; end
 
-require_dependency Rails.root.join("app", "components", "admin", "table_actions_component").to_s
+load Rails.root.join("app", "components", "admin", "table_actions_component.rb")
 
 class Admin::TableActionsComponent
   # Your custom logic here

docs/en/customization/models.md

@@ -5,7 +5,7 @@ If you need to create new models or customize existent ones, you can do it so at
 For example for Madrid's City Hall fork its required to check the zip code's format (it always starts with 280 followed by 2 digits). That check is at `app/models/custom/verification/residence.rb`:
 
 ```ruby
-require_dependency Rails.root.join('app', 'models', 'verification', 'residence').to_s
+load Rails.root.join("app", "models", "verification", "residence.rb")
 
 class Verification::Residence