Full token requirement for InfluxDB v2 and Grafana

Issue described by community user here:
https://community.influxdata.com/t/http-4xx-etc-with-grafana-cloud/56977

##### Relevant URLs
https://docs.influxdata.com/influxdb3/cloud-serverless/process-data/visualize/grafana/?t=InfluxQL&_gl=1*gph9s8*_ga*MTczMjAzMTY4NS4xNjM2MTQ2MjMy*_ga_CNWQ54SDD8*MTc0NDczODc5NC40OC4xLjE3NDQ3NDM3NjYuMjUuMC4zNDE1MTAyNA..*_gcl_au*MTkyMTE0OTkxMC4xNzM4NjE5MjQ4#install-grafana-or-login-to-grafana-cloud

Issues include:
> Following the official InfluxDB tutorial, which has many quirks by the way. It keeps showing confusing snippets about InfluxDB URL’s with and without the availability zone subdomains.

and

>The official documentation claims that simple bucket reading tokens are sufficient for dashboard integration. However, when we follow an aftermarket tutorial it says to use “All Access API” tokens, which works.

Thanks!

Start with the linked InfluxDB Grafana integration documentation and the community report. Compare the documented token permissions and URL examples with the working All Access token guidance, then update the documentation so the required token scope and consistent URL format are explicit.

Written by the indexing model from the issue text.