Fix typo in the netio example

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/examples/netio b/examples/netio
index d173a9f..bb103f1 100644
--- a/examples/netio
+++ b/examples/netio
@@ -2,7 +2,7 @@
 [global]
 ioengine=net
 filename=localhost/8888
-size=4k
+bs=4k
 size=10g
 
 [receiver]