documentation

Pull request #2009: Feature/ZBX-20358 7.2 D

Merge in WEB/documentation from feature/ZBX-20358-7.2-D to release/7.2

* commit 'e046b88117e5074b968a066c63510e748f3a46ef':
  modified web scenario screenshots for correct tags
  formatting changes
  Improved web scenario documentation (ZBX-20358)
  Replaced screenshots (ZBX-20358)
  Updated links due to section name changes (ZBX-20358)
  Updated the text to meet current guidelines (ZBX-20358)
  Rewritten existing content to avoid 1st person; fixed grammatical errors
  Added details about privacy protocols support (ZBX-20358)
  ZBX-20358 improved wording
  fixed page headers
  Added new section about Privacy protocol (ZBX-20358)