Update app_initialization

Author: CuddlyBunion341

ruby_on_rails/app_initialisation.md

@@ -122,7 +122,7 @@ 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.i18n.raise_on_missing_translations = :strict
 
   config.generators do |g|
     g.apply_rubocop_autocorrect_after_generate!
@@ -133,7 +133,7 @@ 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.i18n.raise_on_missing_translations = :strict
   config.i18n.exception_handler = Proc.new { |exception| raise exception.to_exception } # add
   config.active_record.verbose_query_logs = true # add