Document change in results of groupBy queries with subtotalsSpec (#10405)
Document change in results of groupBy queries with subtotalsSpec (#10405)

* subtotalsSpec results with null values

Document the format change in results of a groupBy query with a subtotalsSpec. This update applies to 0.18 and later.

* Review catches
druid-io/druid,jon-wei/druid,gianm/druid,nishantmonu51/druid,gianm/druid,mghosh4/druid,monetate/druid,jon-wei/druid,nishantmonu51/druid,mghosh4/druid,leventov/druid,druid-io/druid,gianm/druid,leventov/druid,monetate/druid,jon-wei/druid,monetate/druid,monetate/druid,nishantmonu51/druid,druid-io/druid,mghosh4/druid,leventov/druid,jon-wei/druid,druid-io/druid,mghosh4/druid,nishantmonu51/druid,leventov/druid,jon-wei/druid,druid-io/druid,monetate/druid,monetate/druid,gianm/druid,gianm/druid,nishantmonu51/druid,nishantmonu51/druid,jon-wei/druid,mghosh4/druid,gianm/druid,jon-wei/druid,leventov/druid,monetate/druid,mghosh4/druid,gianm/druid,mghosh4/druid,nishantmonu51/druid