criu --help: rm extra line after --empty-ns

There is no need to have it here.

Also, remove curly braces around {net} to avoid confusion.

Was:
  --empty-ns {net}
                        Create a namespace, but don't restore its properies
                        (assuming it will be restored by action scripts)

Now:
  --empty-ns net        Create a namespace, but don't restore its properies
                        (assuming it will be restored by action scripts)
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/crtools.c

@@ -890,8 +890,7 @@ usage:
 "                            pipe[inode]\n"
 "                            socket[inode]\n"
 "                            file[mnt_id:inode]\n"
-"  --empty-ns {net}\n"
-"                        Create a namespace, but don't restore its properies\n"
+"  --empty-ns net        Create a namespace, but don't restore its properies\n"
 "                        (assuming it will be restored by action scripts)\n"
 "  -J|--join-ns NS:PID|NS_FILE[,EXTRA_OPTS]\n"
 "			Join exist namespace and restore process in it.\n"