documentation

Pull request #1012: Branchfeature/ZBXNEXT-8390-7.0-D

Merge in WEB/documentation from feature/ZBXNEXT-8390-7.0-D to release/7.0

* commit '8fe6e445da29fc0c29ea13cab3611cac8e9693cc':
  wording: "added -> has been added"
  wording on state filtering is now more precise
  merge test edit
  correct screenshot added
  Whats New updated
  correct wording
  new screenshot added, new feature description noted