Update udpclient.c

tcpclient->udpclient

examples/network/udpclient.c

@@ -89,7 +89,7 @@ static void usage(void)
     rt_kprintf("  -h           Specify host address\n");
     rt_kprintf("  -p           Specify the host port number\n");
     rt_kprintf("  --cnt        Specify the send data count\n");
-    rt_kprintf("  --stop       Stop tcpclient program\n");
+    rt_kprintf("  --stop       Stop udpclient program\n");
     rt_kprintf("  --help       Print help information\n");
 }