「GitとGitHubのセットアップ」の節のGit Graphに関するタイポを修正#911

chvmvd merged 1 commit intomainut-code/utcode-learn:mainfrom

fix-typo-in-git-github-init-sectionut-code/utcode-learn:fix-typo-in-git-github-init-sectionCopy head branch name to clipboard