documentation

Pull request #1720: feature/ZBX-24270-7.0-D2. Improved agent2 installation info accessibility.

Merge in WEB/documentation from feature/ZBX-24270-7.0-D2 to release/7.0

* commit '54a1910caa4d88229e04454228de96d2abe0f680':
  [ZBX-24270] updated link
  [ZBX-24270] fixed formatting
  [ZBX-24270] improved agent2 installation info accessibility