documentation

Pull request #1928: feature/ZBX-24394-7.2-D. Clarified "trigger_housekeeper_execute" behavior.

Merge in WEB/documentation from feature/ZBX-24394-7.2-D to release/7.2

* commit '0c1e450635493e3e1ee2e7c396c849794eb00686':
  [ZBX-24394] clarified "trigger_housekeeper_execute" behavior (refined wording)
  [ZBX-24394] clarified "trigger_housekeeper_execute" behavior (updated zabbix_server manpage)
  [ZBX-24394] clarified "trigger_housekeeper_execute" behavior (refined wording)
  [ZBX-24394] clarified "trigger_housekeeper_execute" behavior (refined wording, added relevant links)
  [ZBX-24394] clarified "trigger_housekeeper_execute" behavior