virsh: Fix typo in docs

s/persitent/persistent/

tools/virsh.pod

@@ -2152,7 +2152,7 @@ Returns basic information about the I<network> object.
 Returns the list of active networks, if I<--all> is specified this will also
 include defined but inactive networks, if I<--inactive> is specified only the
 inactive ones will be listed. You may also want to filter the returned networks
-by I<--persistent> to list the persitent ones, I<--transient> to list the
+by I<--persistent> to list the persistent ones, I<--transient> to list the
 transient ones, I<--autostart> to list the ones with autostart enabled, and
 I<--no-autostart> to list the ones with autostart disabled.