documentation

Pull request #2226: Feature/ZBX-23960 6.0 D c3

Merge in WEB/documentation from feature/ZBX-23960-6.0-D-c3 to release/6.0

* commit '350d4f016571e74124f478c1d785286e7f1b003a':
  ZBX-23960 improved parameter description.
  ZBX-23960 fixed broken links.
  ZBX-23960 descriptions clarifications, typo fix, link fix (comment 3)