Edit requests of 初学者向け：CI連携やHerokuへの自動デプロイも含めたRails環境構築の手引書

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We released Markdown parser changes on February 24, 2022. There may be some unexpected appearance changes in this update, because this article was posted before the changes.
Please don't forget to check the preview before updating your article.
For more information on the changes, please read this article.