Link for Setting Upstream Remote

[braughtg]

Make the phrase "Set the upstream remote" a link to documentation in the 4th bullet point of the "Workflow" section in the CONTRIBUTING document.

Use the link: https://docs.github.com/en/github/collaborating-with-pull-requests/working-with-forks/configuring-a-remote-for-a-fork

Information about making a link in Markdown can be found here: https://docs.github.com/en/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#links

[tainguyen103]

I would like to work on this please!

[github-actions]

Great! I assigned you (@tainguyen103) to the issue. Have fun working on it!