xl.pod.1: add a reference to create in the -e option

Add a reference to the create subcommand in the description of
the -e option to unpause and migrate.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Committed-by: Ian Jackson <Ian.Jackson@eu.citrix.com>

docs/man/xl.pod.1

@@ -337,7 +337,7 @@ Use <sshcommand> instead of ssh.  String will be passed to sh. If empty, run
 =item B<-e>
 
 On the new host, do not wait in the background (on <host>) for the death of the
-domain.
+domain. See the corresponding option of the I<create> subcommand.
 
 =item B<-C> I<config>
 
@@ -377,6 +377,7 @@ Do not unpause domain after restoring it.
 =item B<-e>
 
 Do not wait in the background for the death of the domain on the new host.
+See the corresponding option of the I<create> subcommand.
 
 =item B<-d>