As an example, the section about enabling components contains info for an old version of the monitoring stack which was replaced by the kube-prometheus-stack chart. The documentation also states that you will be able to open a grafana dashboard on port 3000 after following the documentation. That was probably true before they replaced it with the kube-prometheus-stack.
The documentation on the Pulsar website isn't up-to-date. https://pulsar.apache.org/docs/3.1.x/helm-deploy/
Some gaps where brought up here: https://www.reddit.com/r/dataengineering/comments/19dry3i/comment/kjbyobe/