scripts/bad_stable: include instructions to fix and resubmit

scripts/bad_stable: include instructions to fix and resubmit

This basically implements the suggestion from
<https://lore.kernel.org/stable/46577540-6ed7-0ff5-11d5-2982cd29e92b@oracle.com/>.

Sample output:

  To reproduce the conflict and resubmit, you may use the following commands:

  git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
  git checkout FETCH_HEAD
  git cherry-pick -x 9f46c187e2e680ecd9de7983e4d081c3391acc76
  # <resolve conflicts, build, test, etc.>
  git commit -s
  git send-email --to '<stable@vger.kernel.org>' --in-reply-to '<165314153515625@kroah.com>' --subject-prefix 'PATCH 5.15.y' HEAD^..

Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>