git-status: documentation improvements
git-status: documentation improvements

This patch is the result of reading over git-status with an
editorial eye:

  - fix a few typo/grammatical errors
  - mention untracked output
  - present output types in the order they appear from the
    command

Signed-off-by: Jeff King <696e3fbcf235d40b6ea1ebd61c87cbea79d444e7@peff.net>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git