The Wayback Machine - https://web.archive.org/web/20201024223406/https://docs.github.com/ja/free-pro-team@latest/github/setting-up-and-managing-your-github-user-account/managing-the-default-branch-name-for-your-repositories

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リポジトリのデフォルトブランチ名を管理する

You can set the default branch name new repositories that you create on GitHub.

ここには以下の内容があります:

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デフォルトブランチ名について

When you create a new repository on GitHub, the repository contains one branch, which is the default branch. You can change the name that GitHub uses for the default branch in new repositories you create. For more information about the default branch, see "About branches."

You can set the name of the default branch for new repositories. For more information, see "Managing the default branch for your repositories," "Managing the default branch name for repositories in your organization," or "Enforcing a policy on the default branch name."