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/sa.c

@@ -110,6 +110,7 @@
  * location.
  *
  * Byteswap implications:
+ *
  * Since the SA attributes are not entirely self describing we can't do
  * the normal byteswap processing.  The special ZAP layout attribute and
  * attribute registration attributes define the byteswap function and the
@@ -188,7 +189,6 @@ sa_attr_reg_t sa_legacy_attrs[] = {
 };
 
 /*
- * ZPL legacy layout
  * This is only used for objects of type DMU_OT_ZNODE
  */
 sa_attr_type_t sa_legacy_zpl_layout[] = {
@@ -198,7 +198,6 @@ sa_attr_type_t sa_legacy_zpl_layout[] = {
 /*
  * Special dummy layout used for buffers with no attributes.
  */
-
 sa_attr_type_t sa_dummy_zpl_layout[] = { 0 };
 
 static int sa_legacy_attr_count = 16;