Add periods to list in creating-a-commit-on-behalf-of-an-organization.md

[nguyenalex836]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/creating-a-commit-on-behalf-of-an-organization

This issue is intended for newcomers to the OS Docs repo! 💛

If you are veteran of the OS Docs repo and are looking for issues to work on, take a look at our help wanted section ✨

What part(s) of the article would you like to see updated?

To create commits on behalf of an organization:

• You must be a member of the organization indicated in the trailer
• You must sign the commit
• Your commit email and the organization email must be in a domain verified by the organization
• Your commit message must end with the commit trailer on-behalf-of: @org <[email protected]>

Add periods to the end of each list line, as each line is a complete sentence

Additional information

Style guide reference