documentation

Pull request #2113: feature/ZBXNEXT-9233-7.2-D: Removed 30k dependent item limit.

Merge in WEB/documentation from feature/ZBXNEXT-9233-7.2-D to release/7.2

* commit '2804832e3f6eef2916b613511d443e174ba2dd35':
  [ZBXNEXT-9233] Removed mentions
  [ZBXNEXT-9233] Adjusted wording
  [ZBXNEXT-9233] Adjusted wording
  [ZBXNEXT-9233] Removed 30k dependent item limit