Update kube-jupyterhub.md

kube-jupyterhub.md

 ```bash
-curl https://get.helm.sh/helm-v3.8.0-linux-amd64.tar.gz --output helm-v3.8.0-linux-amd64.tar.gz
-tar -zxvf helm-v3.8.0-linux-amd64.tar.gz
-mv linux-amd64/helm /usr/local/bin/helm
+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
+/root/.local/bin:/root/bin:/srv/magnum/bin:/srv/magnum/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/var/lib/snapd/snap/bin
+
+/srv/magnum/bin/helm version
+version.BuildInfo{Version:"v3.2.1", GitCommit:"fe51cd1e31e6a202cba7dead9552a6d418ded79a", GitTreeState:"clean", GoVersion:"go1.13.10"}
+
+The new installed helm in /root/bin
+
+helm version
+version.BuildInfo{Version:"v3.5.0", GitCommit:"32c22239423b3b4ba6706d450bd044baffdcf9e6", GitTreeState:"clean", GoVersion:"go1.15.6"}
+
+
+
 ```
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