docs: biotop: Update guide to reflect gadget output.
@@ -15,9 +15,8 @@ The gadget doesn't support the following flags:
$ kubectl gadget biotop --node ip-10-0-30-247 --all-namespaces
14:28:17 loadavg: 0.53 0.32 0.34 8/528 43043
-
-PID COMM D MAJ MIN DISK I/O Kbytes AVGms
-1860 etcd W 253 0 vda 3 24 0.38
+NAMESPACE POD CONTAINER PID COMM D MAJ MIN DISK I/O Kbytes AVGms
+kube-system etcd-minikube etcd 1860 etcd W 253 0 vda 3 24 0.38
```
We can leave the monitoring with Ctrl-C.
