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.

include/sys/unique.h

@@ -26,8 +26,6 @@
 #ifndef	_SYS_UNIQUE_H
 #define	_SYS_UNIQUE_H
 
-
-
 #include <sys/zfs_context.h>
 
 #ifdef	__cplusplus
@@ -42,7 +40,7 @@ void unique_fini(void);
 
 /*
  * Return a new unique value (which will not be uniquified against until
- * it is unique_insert()-ed.
+ * it is unique_insert()-ed).
  */
 uint64_t unique_create(void);