MFC r212703 (by pjd):

MFC r212703 (by pjd):
  Make the message that informs about bootcode being written to disk less
  confusing.

  Note there is still no information about 'partcode' being written to disk
  (gpart bootcode -p <partcode> <disk>).

  Maybe in the future all the messages printed by gpart(8) on success could
  be hidden under -v?

  PR:		bin/150239
  Reported by:	Roddi <roddi@me.com>
  Submitted by:	arundel

Approved by:	kib (mentor)

git-svn-id: svn://svn.freebsd.org/base/stable/8@213374 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f