Fix odd indentation [ci skip]

Author: kamipo

guides/source/getting_started.md

@@ -1881,7 +1881,7 @@ active_record_migrations.html).
 We also have to permit the `:status` key as part of the strong parameter, in `app/controllers/articles_controller.rb`:
 
 ```ruby
-private
+  private
     def article_params
       params.require(:comment).permit(:commenter, :body, :status)
     end
@@ -1890,7 +1890,7 @@ private
 and in `app/controllers/comments_controller.rb`:
 
 ```ruby
-private
+  private
     def comment_params
       params.require(:comment).permit(:commenter, :body, :status)
     end