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「API ドキュメント作成ガイドライン」のコマンド実行のコードのフォーマットがおかしかったので修正します。
不要な空白が入っていて、表示がおかしくなっていました。
before
after
なお英語の原文でもこのPRの修正のように、
$
が先頭に書かれているようです。https://guides.rubyonrails.org/api_documentation_guidelines.html#rdoc