<repository> should be the name of a remote repository as
passed to linkgit:git-fetch[1]. <refspec> can name an
arbitrary remote ref (for example, the name of a tag) or even
-a collection of refs with corresponding remote tracking branches
+a collection of refs with corresponding remote-tracking branches
(e.g., refs/heads/*:refs/remotes/origin/*), but usually it is
the name of a branch in the remote repository.