rocksdb: Fix comments about ConsolidateTimeSeriesValue accumulating samples
rocksdb: Fix comments about ConsolidateTimeSeriesValue accumulating samples

It looks like b1373fb missed some comments which still maintained the
notion that samples with identical offsets were accumulated instead of
truncated. This change fixes these comments.

paperstreet/cockroach,vivekmenezes/cockroach,petermattis/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,cockroachdb/cockroach,sunya123/cockroach,vaibhavarora/cockroach,glycerine/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,cockroachdb/cockroach,paperstreet/cockroach,veteranlu/cockroach,petermattis/cockroach,vivekmenezes/cockroach,veteranlu/cockroach,sunya123/cockroach,vaibhavarora/cockroach,glycerine/cockroach,paperstreet/cockroach,vivekmenezes/cockroach,glycerine/cockroach,veteranlu/cockroach,glycerine/cockroach,petermattis/cockroach,paperstreet/cockroach,paperstreet/cockroach,petermattis/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,arjun4084346/cockroach,maxlang/cockroach,sunya123/cockroach,sunya123/cockroach,cockroachdb/cockroach,maxlang/cockroach,vivekmenezes/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,glycerine/cockroach,vaibhavarora/cockroach,maxlang/cockroach,veteranlu/cockroach,sunya123/cockroach,arjun4084346/cockroach,paperstreet/cockroach,sunya123/cockroach,cockroachdb/cockroach,petermattis/cockroach,glycerine/cockroach,veteranlu/cockroach,maxlang/cockroach,vivekmenezes/cockroach,glycerine/cockroach,petermattis/cockroach,maxlang/cockroach,glycerine/cockroach,veteranlu/cockroach,cockroachdb/cockroach,vivekmenezes/cockroach,vaibhavarora/cockroach,maxlang/cockroach,cockroachdb/cockroach,sunya123/cockroach,maxlang/cockroach,petermattis/cockroach,maxlang/cockroach,paperstreet/cockroach,arjun4084346/cockroach,paperstreet/cockroach,arjun4084346/cockroach,veteranlu/cockroach,cockroachdb/cockroach,petermattis/cockroach,veteranlu/cockroach,sunya123/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach