Remove the redundant parentheses in migrate help

Signed-off-by: NYanbing Du <ydu@redhat.com>

tools/virsh-domain.c

@@ -8286,7 +8286,7 @@ static const vshCmdOptDef opts_migrate[] = {
     },
     {.name = "change-protection",
      .type = VSH_OT_BOOL,
-     .help = N_("prevent any configuration changes to domain until migration ends)")
+     .help = N_("prevent any configuration changes to domain until migration ends")
     },
     {.name = "unsafe",
      .type = VSH_OT_BOOL,