help: Move --page-server option in help text

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

crtools.c

@@ -408,9 +408,9 @@ usage:
 "* Memory dumping options:\n"
 "  --track-mem           turn on memory changes tracker in kernel\n"
 "  --prev-images-dir DIR path to images from previous dump (relative to -D)\n"
+"  --page-server         send pages to page server (see options below as well)\n"
 "\n"
 "Page server options\n"
-"  --page-server         send pages to page server (for 'dump' command)\n"
 "  --address ADDR        address of page server\n"
 "  --port PORT           port of page server\n"
 "\n"