Period needs to be moved inside quotation marks in github-flow.md

[nguyenalex836]

Code of Conduct

• [X] 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/get-started/using-github/github-flow#make-changes

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

... or "Deleting files in a repository".

Period should be moved inside ending quotation marks to maintain consistency with other docs and style guide

Additional information

No response