Update comment for isPercentileIdEqualToSeriesId

Author: DianaDerevyankina

src/plugins/vis_types/xy/public/utils/accessors.tsx

@@ -83,7 +83,7 @@ export const getSplitSeriesAccessorFnMap = (
   return m;
 };
 
-// For percentile aggregation id is coming in the form `%d.%d`, where first `%d` is `id` and the second - `percents`
+// For percentile, the aggregation id is coming in the form %s.%d, where %s is agg_id and %d - percents
 export const isPercentileIdEqualToSeriesId = (columnId: number | string, seriesColumnId: string) =>
   columnId.toString().split('.')[0] === seriesColumnId;