zfs-create(8): ZFS for swap: mention the FAQ doc

Instead of describing just one of the steps that are appropriate to avoid deadlock, mention the FAQ.

Related: <https://openzfs.github.io/openzfs-docs/Project%20and%20Community/FAQ.html#using-a-zvol-for-a-swap-device-on-linux> (Using a zvol for a swap device on Linux).

man/man8/zfs-create.8

@@ -237,11 +237,7 @@ Print verbose information about the created dataset.
 .Ss ZFS for Swap
 Swapping to a ZFS volume is possible, however care must be taken to avoid
 deadlocks.
-After creating the volume with
-.Nm zfs Cm create Fl V ,
-enable the swap area using the
-.Xr swapon 8
-command.
+See OpenZFS FAQ.
 .Pp
 Swapping to a file on a ZFS filesystem is not supported.
 .