documentation

Pull request #2000: feature/DEV-3914-7.0-D. restricted mediatype.get for Admin type users.

Merge in WEB/documentation from feature/DEV-3914-7.0-D to release/7.0

* commit '1a6f8d024491bb9c43e773a4bcfe4b3479da2ce6':
  [DEV-3914] refined changelog
  [DEV-3914] updated special `output` parameter to have special description
  [DEV-3914] updated "output" and "mediaids" parameter; refined noteclassic and example; added "since Zabbix 7.0.4" where necessary
  [DEV-3914] removed redundancy from "filter" parameter description
  [DEV-3914] added line breaks
  [DEV-3914] restricted mediatype.get for Admin type users
  [DEV-3914] fixed media type object "script" property type
  [DEV-3914] refined changelog
  [DEV-3914] fixed media type object "description" property type
  [DEV-3914] fixed punctuation
  [DEV-3914] made example description consistent with other examples
  [DEV-3914] made "search" parameter description consistent
  [DEV-3914] restricted mediatype.get for Admin type users