OpenZFS 6765 - zfs_zaccess_delete() comments do not accurately

reflect delete permissions for ACLs

Authored by: Kevin Crowe <kevin.crowe@nexenta.com>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Reviewed by: Yuri Pankov <yuri.pankov@nexenta.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Approved by: Richard Lowe <richlowe@richlowe.net>
Ported-by: Paul B. Henson <henson@acm.org>

Porting Notes:

• Only comments are updated

OpenZFS-issue: https://www.illumos.org/issues/6765
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/da412744bc
Closes #10266