3741 zfs needs better comments
Submitted by:	Will Andrews <willa@spectralogic.com>
Submitted by:	Justin Gibbs <justing@spectralogic.com>
Submitted by:	Alan Somers <alans@spectralogic.com>
Reviewed by:	Matthew Ahrens <mahrens@delphix.com>
3742 zfs comments need cleaner, more consistent style
Submitted by:	Will Andrews <willa@spectralogic.com>
Submitted by:	Alan Somers <alans@spectralogic.com>
Reviewed by:	Matthew Ahrens <mahrens@delphix.com>
Reviewed by:	George Wilson <george.wilson@delphix.com>