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Mateusz Piotrowski
5119386711
People still believe that it is essential to run sync(8) a couple of
times before a reboot/halt. Document that this has not been necessary
for a long time now.
Reviewed by: imp, bcr, Pau Amma <[email protected]>
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D33233
(cherry picked from commit 177ba18307)