In the process of learning Github, I forked my friend's repository to work on some of the code. I cloned the fork to my computer and added the upstream remote so I could update my repository with his. Now when I view my branches with git branch in Git Shell, it shows 5 branches: my own master, 2 from upstream, and then 2 more. These two are the same as the two upstream ones, but instead of "upstream" it says my friend's name. What's the difference between these two branches and the two upstream branches?
I'm referring to the first two in the following picture.
