Merge branch 'rr/shortlog-doc'

Update documentation for "log" and "shortlog". * rr/shortlog-doc: builtin/shortlog.c: make usage string consistent with log builtin/log.c: make usage string consistent with doc git-shortlog.txt: make SYNOPSIS match log, update OPTIONS git-log.txt: rewrite note on why "--" may be required git-log.txt: generalize <since>..<until> git-log.txt: order OPTIONS properly; move <since>..<until> revisions.txt: clarify the .. and ... syntax git-shortlog.txt: remove (-h|--help) from OPTIONS