documentation

Pull request #1660: feature/ZBX-24130-7.0-D. Clarified user/role behavior.

Merge in WEB/documentation from feature/ZBX-24130-7.0-D to release/7.0

* commit 'c59530eb038e60a223b6371eb09d67a799fd053f':
  [ZBX-24130] Clarified user/role behavior
  Concised phrasing
  Updated wording & formatting
  Refined wording & formatting
  [ZBX-24130] Clarified user/role behavior