Edit requests of Ruby + Ruby on Rails4 開発環境の準備【Mac OSX Yosemite, Mavericks, MountaiLion 対応】

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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.