Illumos #3742

3742 zfs comments need cleaner, more consistent style
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Approved by: Christopher Siden <christopher.siden@delphix.com>

References:
  https://www.illumos.org/issues/3742
  illumos/illumos-gate@f717074149

Ported-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1775

Porting notes:

1. The change to zfs_vfsops.c was dropped because it involves
   zfs_mount_label_policy, which does not exist in the Linux port.

module/zfs/spa.c

@@ -4585,6 +4585,7 @@ spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing)
 
 /*
  * Detach a device from a mirror or replacing vdev.
+ *
  * If 'replace_done' is specified, only detach if the parent
  * is a replacing vdev.
  */
@@ -5242,11 +5243,9 @@ spa_vdev_remove_from_namespace(spa_t *spa, vdev_t *vd)
  * the spa_vdev_config_[enter/exit] functions which allow us to
  * grab and release the spa_config_lock while still holding the namespace
  * lock.  During each step the configuration is synced out.
- */
-
-/*
- * Remove a device from the pool.  Currently, this supports removing only hot
- * spares, slogs, and level 2 ARC devices.
+ *
+ * Currently, this supports removing only hot spares, slogs, and level 2 ARC
+ * devices.
  */
 int
 spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare)
@@ -5356,7 +5355,7 @@ spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare)
 
 /*
  * Find any device that's done replacing, or a vdev marked 'unspare' that's
- * current spared, so we can detach it.
+ * currently spared, so we can detach it.
  */
 static vdev_t *
 spa_vdev_resilver_done_hunt(vdev_t *vd)