Merge branch 'patch-250' into 'master'

Use the correct chart for helm command

See merge request gitlab-org/gitlab!43487

doc/user/clusters/agent/index.md

@@ -81,7 +81,8 @@ When installing or upgrading the GitLab Helm chart, consider the following Helm
 for the Agent to be properly installed and configured:
 
 ```shell
-helm upgrade --force --install gitlab . \
+helm repo update
+helm upgrade --force --install gitlab gitlab/gitlab \
   --timeout 600 \
   --set global.hosts.domain=<YOUR_DOMAIN> \
   --set global.hosts.externalIP=<YOUR_IP> \