doc: git-pull: move <repository> and <refspec> params
From user feedback: - it's confusing that we use both <branch> and <refspec> to refer to the second argument - one user is not clear about what `refs/heads/*:refs/remotes/origin/*` is meant to be an example of ("is it like a path?") The DESCRIPTION section is also doing a lot right now: it's trying to describe both how the <repository> and <refspec> arguments work (which is pretty complex, as seen in the DEFAULT BEHAVIOUR section) as well as how `git pull` calls `git fetch` and merge/rebase/etc depending on the arguments. Handle this by moving the description of the <repository> and <refspec> arguments to the OPTIONS section, so that we can focus on the merge/rebase/etc behaviour in the DESCRIPTION section, and refer folks to the later sections for details. Use the term "upstream" instead of 'the "remote" and "merge" configuration for the current branch' since users are more likely to know what an "upstream" is. Signed-off-by: Julia Evans <julia@jvns.ca> Signed-off-by: Junio C Hamano <gitster@pobox.com>