Include generator config for dev environment (#403)

* Include generator config for dev environment

* Make linter happy

Author: sislr

ruby_on_rails/app_initialisation.md

@@ -126,6 +126,11 @@ Check existing projects for an example of the usage.
   ```ruby
   config.action_controller.action_on_unpermitted_parameters = :raise
   config.i18n.raise_on_missing_translations = true # uncomment
+
+  config.generators do |g|
+    g.test_framework :rspec
+    g.apply_rubocop_autocorrect_after_generate!
+  end
   ```
 
 * Update `config/environments/test.rb` settings: