virsh: Clean up man page formatting for vol-list and vol-pool

Make the output more readable.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

tools/virsh.pod

@@ -4216,16 +4216,21 @@ have different physical and allocation values.
 =item B<vol-list> [I<--pool> I<pool-or-uuid>] [I<--details>]
 
 Return the list of volumes in the given storage pool.
+
 I<--pool> I<pool-or-uuid> is the name or UUID of the storage pool.
+
 The I<--details> option instructs virsh to additionally display volume
 type and capacity related information where available.
 
-=item B<vol-pool> [I<--uuid>] I<vol-key-or-path>
+=item B<vol-pool> I<vol-key-or-path> [I<--uuid>]
 
 Return the pool name or UUID for a given volume. By default, the pool name is
-returned. If the I<--uuid> option is given, the pool UUID is returned instead.
+returned.
+
 I<vol-key-or-path> is the key or path of the volume to return the pool
-information for.
+information.
+
+If the I<--uuid> option is given, the pool UUID is returned instead.
 
 =item B<vol-path> [I<--pool> I<pool-or-uuid>] I<vol-name-or-key>