Prometheus: Add documentation for ad-hoc filters (#31122)
Prometheus: Add documentation for ad-hoc filters (#31122)

* Prometheus: Add documentation for ad-hoc filters

* Update docs/sources/datasources/prometheus.md

Co-authored-by: achatterjee-grafana <5ed7255a3b2540ccce8f5b30c47e4a93678b261d@users.noreply.github.com>

* Update docs/sources/datasources/prometheus.md

Co-authored-by: achatterjee-grafana <5ed7255a3b2540ccce8f5b30c47e4a93678b261d@users.noreply.github.com>

* Add link to ad hoc filters doumentation

* Change direct url for relative

Co-authored-by: achatterjee-grafana <5ed7255a3b2540ccce8f5b30c47e4a93678b261d@users.noreply.github.com>
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