Update kube-jupyterhub.md

kube-jupyterhub.md

+#CoreOS-35
 ```bash
-CoreOS-35
 Install the helm version (3.5.0) of the CoreOS 35 without reboot
 curl https://get.helm.sh/helm-v3.5.0-linux-amd64.tar.gz --output helm-v3.5.0-linux-amd64.tar.gz
 tar -zxvf helm-v3.5.0-linux-amd64.tar.gz
 mkdir -p /root/bin
 cp linux-amd64/helm /root/bin
+---
 
 The default helm installed by magnum:
 echo $PATH