virsh: Add missed fields to pool-define-as item entry

https://bugzilla.redhat.com/show_bug.cgi?id=1615680

Commit id d45bee44 updated the pool-define-as qualifier descriptions
to add some new fields, but neglected to modify the command item list
in order to add those fields as well.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

tools/virsh.pod

@@ -3831,7 +3831,9 @@ just I<--build> is provided, then B<pool-build> is called with no flags.
 [I<--auth-type authtype> I<--auth-username username>
 [I<--secret-usage usage> | I<--secret-uuid uuid>]]
 [[I<--adapter-name name>] | [I<--adapter-wwnn> wwnn I<--adapter-wwpn> wwpn]
-[I<--adapter-parent parent>]]
+[I<--adapter-parent parent> |
+ I<--adapter-parent-wwnn parent_wwnn> I<adapter-parent-wwpn parent_wwpn> |
+ I<--adapter-parent-fabric-wwn parent_fabric_wwn>]]
 [I<--build>] [[I<--overwrite>] | [I<--no-overwrite>]] [I<--print-xml>]