zfprops(8): fix spacing in jailed= arguments

Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Ahelenia Ziemiańska <[email protected]>
Closes openzfs#11866

Author: nabijaczleweli

man/man8/zfsprops.8

@@ -1817,7 +1817,7 @@ are equivalent to the
 and
 .Sy noxattr
 mount options.
-.It Sy jailed Ns = Ns Cm off | on
+.It Sy jailed Ns = Ns Sy off Ns | Ns Sy on
 Controls whether the dataset is managed from a jail. See the
 .Qq Sx Jails
 section in