Documentation states:

It is not clear to users what does "start the trigger housekeeping procedure" mean. Looks like it is the way to delete orphaned problems/events of the previously deleted triggers.

What I think should be added:

• find out what exactly this option does
• describe it properly
• document if it's the only way to do it
• maybe add some additional details, like what if this options isn't run from time to time

Same issue in the online version of the man page and the mane page itself:

man man/zabbix_server.man
[...]
  trigger_housekeeper_execute
    Execute the trigger housekeeper.  Ignored if trigger housekeeper is being currently executed. 

This is why Incident report instead of Documentation task, as it requires changes in the product repository code.