Commit Message: Add section how to create commit message with subject

[nguyenlekhtn]

Because

Commit Message lesson introduced "commit with subject" but doesn't show how to make ones

This PR

• Show how to make a commit with subject and body in message
• Add a quick link to remind about changing the commit editor from Git Basics to make sure learners have changed it to VS Code.

Issue

Closes #28471

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum contributing guide
• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• If any lesson files are included in this PR, they follow the Layout Style Guide

[MaoShizhong]

Many thanks! Just a couple of nits and change of section location, but otherwise, thanks for getting this added!

[MaoShizhong]

🙏