Please add some details/example to the documentation for "MaxHousekeeperDelete" parameter. I suggest to add such example and note:

For example, we have to remove 1 item prototype linked to 50 hosts and for every host this item prototype is expanded in 100 real items, in this way we have to remove 5000 Items (1*50*100). If we configure MaxHousekeeperDelete=500, Housekeeper process will have to remove up to 2500000 values (5000*500) for deleted items from history and trends tables.
Note, when a lot of items are deleted it increases load to the database, because housekeeper needs to remove all the history data that these items had.