simplify in-line comment a bit

Signed-off-by: Anton Gilgur <[email protected]>

persist/sqldb/workflow_archive.go

@@ -184,12 +184,9 @@ func (r *workflowArchive) ListWorkflows(options sutils.ListOptions) (wfv1.Workfl
 		subSelector = r.session.SQL().Select(db.Raw("*")).From(subSelector).As("x")
 	}
 
-	// why using a subquery: the json unmarshaling process of coalesce
-	// (workflow) is always triggered for every records in the filtering query
-	// in postgres (and maybe mysql as well?). by first filtering out uid first
-	// without trying to unmarshal the workflow, it kinda teach the database to
-	// delay the json parsing operation and thus speed up the query (could be
-	// up to 257 times faster for some deployments).
+	// why a subquery? the json unmarshal triggers for every row in the filter query.
+	// by filtering on uid first, we delay json parsing until a single row, speeding up the query
+	// (e.g. up to 257 times faster for some deployments).
 	selector := r.session.SQL().Select(selectQuery).From(archiveTableName).Where(
 		r.clusterManagedNamespaceAndInstanceID().And(db.Cond{"uid IN": subSelector}),
 	)