tools: Reduce table width in virsh(1)

The table included in the sample output for 'list --title' is
unnecessarily wide, which causes man to complain:

  warning [p 8, 0.5i]: can't break line

Make the table narrower.

Spotted by Lintian (manpage-has-errors-from-man tag).
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Acked-by: NMichal Privoznik <mprivozn@redhat.com>

tools/virsh.pod

@@ -545,10 +545,10 @@ I<--table> output.
 Example:
 
 B<virsh> list --title
-  Id    Name                           State      Title
- --------------------------------------------------------------------------
-  0     Domain-0                       running    Mailserver 1
-  2     fedora                         paused
+  Id    Name        State      Title
+ -------------------------------------------
+  0     Domain-0    running    Mailserver 1
+  2     fedora      paused
 
 =item B<freecell> [{ [I<--cellno>] B<cellno> | I<--all> }]