documentation

Pull request #2328: Feature/ZBX-24644 7.2 D

Merge in WEB/documentation from feature/ZBX-24644-7.2-D to release/7.2

* commit 'a850d495e30c93d43bd5400032dd5ba2447f36cc':
  ZBX-24644 added a note.
  ZBX-24644 adjusted what's new page.
  ZBX-24644 added information of renaming a block, and short info of how to access it.
  ZBX-24644 changed the block name.