git branch incorrect command

[wpgoble]

In section 3.3 question 2.b has the user specify a git branch command that will allow them to switch to the main branch.

Question

If a user tries the git branch <branch-name> command with an already existing branch name, then they should receive a fatal error and a message that lets them know that branch already exists. I think we should clarify that the command they should use to move between branches is either git checkout <branch-name> or git switch <branch-name>

I've included a screenshot from a random OSS project just to demonstrate that this command should result in an error.