[release-v2.6] [DOC] Update metrics query docs with examples, more details #4250
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Backport 532f83f from #4248
What this PR does:
Second try. Original PR with review comments: #4128
This doc has a first draft of a use case for using TraceQL metrics queries to investigate an issue. The example provides equivalent PromQL and TraceQL queries.
Updates the TraceQL metrics documentation to add:
Which issue(s) this PR fixes:
Fixes https://github.com/grafana/tempo-squad/issues/413
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]