documentation

Pull request #2072: Feature/ZBX-25453 7.2 D

Merge in WEB/documentation from feature/ZBX-25453-7.2-D to release/7.2

* commit 'b6d3b3422ae8b68ca80eed040c164942da952df1':
  [ZBX-25453] improved repository structure descriptions
  described repo structure changes (ZBX-25453)
  Fixed a typo
  updated links to Zabbix repository (ZBX-25453)