Fix a couple of typos in I18n documentation

Author: Quentin de Metz

development/i18n.md

@@ -16,9 +16,9 @@ The following configuration is necessary on I18n so that:
     `locales` directory
 
 ```ruby
-configure
+configure do
   I18n::Backend::Simple.send(:include, I18n::Backend::Fallbacks)
-  I18n.load_path, Dir[File.join(settings.root, 'locales', '*.yml')]
+  I18n.load_path = Dir[File.join(settings.root, 'locales', '*.yml')]
   I18n.backend.load_translations
 end
 ```