documentation

Pull request #2160: Feature/ZBX-25537 6.0 D

Merge in WEB/documentation from feature/ZBX-25537-6.0-D to release/6.0

* commit '2af17d9265e83aa3c316cf24d3983bde585544a0':
  ZBX-25537 improved macros description.
  ZBX-25537 missing dot fixed.
  ZBX-25537 item and proxy macro description for numbered item/proxy macro now correctly refer to the item; improved description clarity.