[release-v2.6] [DOC] Update metrics query docs with examples, more details #9436

Job	Run time
Lint	2m 58s
Run Unit Tests (test-with-cover-pkg)	3m 2s
Run Unit Tests (test-with-cover-tempodb)	8m 42s
Run Unit Tests (test-with-cover-tempodb-wal)	8m 36s
Benchmark	8m 38s
Run Unit Tests (test-with-cover-others)	8m 37s
Build	1m 48s
Run integration tests (test-e2e)	8m 38s
Run integration tests (test-integration-poller)	8m 37s
Build technical documentation	22s
Run integration tests (test-e2e-deployments)	8m 38s
Run integration tests (test-e2e-serverless)	6m 58s
Check jsonnet & tempo-mixin	53s
Vendor check	1m 36s
	1h 18m 3s

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