[DOC] Update metrics query docs with examples, more details #9435

Job	Run time
Lint	3m 21s
Run Unit Tests (test-with-cover-pkg)	3m 12s
Run Unit Tests (test-with-cover-tempodb)	15m 31s
Run Unit Tests (test-with-cover-tempodb-wal)	11m 33s
Benchmark	9m 37s
Run Unit Tests (test-with-cover-others)	12m 25s
Build	1m 48s
Build technical documentation	22s
Run integration tests (test-e2e)	20m 31s
Check jsonnet & tempo-mixin	49s
Run integration tests (test-integration-poller)	10m 19s
Run integration tests (test-e2e-deployments)	13m 49s
Vendor check	1m 28s
Run integration tests (test-e2e-serverless)	7m 2s
	1h 51m 47s

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