docs: details for pmSeriesQuery(3) and related time series APIs
docs: details for pmSeriesQuery(3) and related time series APIs

Resolves https://github.com/performancecopilot/pcp/issues/803

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp