Fix T51328: Add note to cmdline help that threads must be first

source/creator/creator_args.c

@@ -1163,6 +1163,7 @@ static const char arg_handle_threads_set_doc[] =
 "<threads>\n"
 "\tUse amount of <threads> for rendering and other operations\n"
 "\t[1-" STRINGIFY(BLENDER_MAX_THREADS) "], 0 for systems processor count."
+"(This must be the first argument)"
 ;
 static int arg_handle_threads_set(int argc, const char **argv, void *UNUSED(data))
 {