documentation

Pull request #183: Feature/ZBXNEXT-7553 6.2 D

Merge in WEB/documentation from feature/ZBXNEXT-7553-6.2-D to release/6.2

* commit 'd9175bc963296f99ac3674c0564ca936c8f89dd2':
  whatsnew620.md minor fix
  [ZBXNEXT-7553] Better  tag  description (supported_by_location_user.md)
  [ZBXNEXT-7553] New user macro cache (whatsnew620.md)