Move period inside ending quotation marks in github-glossary#upstream-branch

[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/get-started/learning-about-github/github-glossary#upstream-branch

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

If the upstream branch of A is origin/B sometimes we say "A is tracking origin/B".

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

Additional information

No response