mount.8 update

[bch]

--- ./src/sbin/mount/mount.8.orig       2014-12-05 17:58:59.000000000 -0800
+++ ./src/sbin/mount/mount.8    2014-12-05 17:59:19.000000000 -0800
@@ -523,6 +523,7 @@
 .Xr fsck 8 ,
 .Xr mount_ados 8 ,
 .Xr mount_cd9660 8 ,
+.Xr mount_chfs 8 ,
 .Xr mount_ext2fs 8 ,
 .Xr mount_fdesc 8 ,
 .Xr mount_ffs 8 ,