5410 Document -S option to zfs inherit

5410 Document -S option to zfs inherit
5412 Mention -S option when zfs inherit fails on quota
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

References:

https://www.illumos.org/issues/5410
https://github.com/illumos/illumos-gate/commit/5ff8cfa9

Ported-by: DHE <git@dehacked.net>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3279