Add link to docs with (i) icon

We created some docs around how to understand profile types here: https://grafana.com/docs/pyroscope/next/ingest-and-analyze-profile-data/profiling-types/#cpu-profiling

and we also have the corresponding label in the profile-metrics.json file here: https://github.com/grafana/pyroscope/blob/main/public/app/constants/profile-metrics.json#L86-L91

Sometimes a user may want to learn more about a profile type so it would be nice if there was a little (i) icon here which would explain more about a profile type for the user.

this could be done by adding another field to the profile-metrics.json file which would link to the relevant entry in the grafana profile types documentation