tools: Add the wwnn/wwpn to the man page for storage pool fields

The description was missing the wwnn and wwpn names for the
--adapter-wwnn and --adapter-wwpn switches. Just add it to be
clear that the fields cannot be empty (IOW they are not boolean).
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

tools/virsh.pod

@@ -3725,7 +3725,7 @@ just I<--build> is provided, then B<pool-build> is called with no flags.
 [I<--source-name name>] [I<--target path>] [I<--source-format format>]
 [I<--auth-type authtype> I<--auth-username username>
 [I<--secret-usage usage> | I<--secret-uuid uuid>]]
-[[I<--adapter-name name>] | [I<--adapter-wwnn> I<--adapter-wwpn>]
+[[I<--adapter-name name>] | [I<--adapter-wwnn> wwnn I<--adapter-wwpn> wwpn]
 [I<--adapter-parent parent>]]
 [I<--build>] [[I<--overwrite>] | [I<--no-overwrite>]] [I<--print-xml>]
 
@@ -3768,10 +3768,10 @@ be provided, but not both.
 [I<--adapter-name name>] defines the scsi_hostN adapter name to be used for
 the scsi_host adapter type pool.
 
-[I<--adapter-wwnn> I<--adapter-wwpn> [I<--adapter-parent parent>]] defines
-the wwnn and wwpn to be used for the fc_host adapter type pool. The parent
-optionally provides the name of the scsi_hostN node device to be used for
-the vHBA.
+[I<--adapter-wwnn wwnn> I<--adapter-wwpn wwpn> [I<--adapter-parent parent>]]
+defines the wwnn and wwpn to be used for the fc_host adapter type pool.
+The parent optionally provides the name of the scsi_hostN node device to
+be used for the vHBA.
 
 [I<--build>] [[I<--overwrite>] | [I<--no-overwrite>]] perform a
 B<pool-build> after creation in order to remove the need for a