git: vfs_unmountall.9: Document the new halting argument.

[Sascha Wildner]

commit b88a2e6dd5cdb7495a3fcd66265f2f41b0240abf
Author: Sascha Wildner <saw at online.de>
Date:   Fri Mar 23 13:47:29 2018 +0100

    vfs_unmountall.9: Document the new halting argument.

Summary of changes:
 share/man/man9/vfs_unmountall.9 | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/b88a2e6dd5cdb7495a3fcd66265f2f41b0240abf


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