Feature: Enhance the visibility of the "Update branch button" section

Describe the enhancement or feature you would like

This is something I find myself informing new contributors about daily. It should be made more visible in some way. (Then there is the problem of increasing the viability of the devguide itself...)

For now I think it would be good to move the section to just below the submitting section rather than the bottom of the file.

Describe alternatives you have considered

No response

Additional context

No response

リンクされている pull request のライフサイクルに関するドキュメントの「Update branch button」セクションから始め、現在の位置を「submitting」セクションと比較します。そのセクションを「submitting」の直下に移動し、ページの順序とリンクが引き続き正しいことを確認します。