Add: Remote branches are on local, not on the remote repository

[ooker777]

In lesson remote2 and so on, it takes me a while and several rereads to realize that the remote branch is on local, not on the remote repository. Therefore, I suggest we to add this note on the first popup of the remote2 lesson:

To be clear: Remote branches are on your local repository, not on the remote repository

[pcottle]

Yeah that sounds good! want to attempt the pull request to change this?

[ooker777]

let me get to that lesson first :P