documentation

Pull request #1726: feature/ZBX-24270-6.0-D2. Improved agent2 installation info accessibility.

Merge in WEB/documentation from feature/ZBX-24270-6.0-D2 to release/6.0

* commit '7bab15cb4b7b4c43c1edbf4194a06a2cfd4c816f':
  [ZBX-24270] removed whitespace
  [ZBX-24270] improved agent2 installation info accessibility