documentation

Pull request #519: [ZBXNEXT-7972] Updates on trigger URL

Merge in WEB/documentation from feature/ZBXNEXT-7972-6.4-D to release/6.4

* commit '0a38428bb8cbf9b8b670746b7c8ed3d2af4d4ad2':
  [ZBXNEXT-7972] Updated "What's new" page
  [ZBXNEXT-7972] Updated "What's new" page
  [ZBXNEXT-7972] Updated "What's new" page
  [ZBXNEXT-7972] Updated ancient images on page "Trigger prototypes"
  [ZBXNEXT-7972] Added supported char count for new params
  [ZBXNEXT-7972] Updated multiple pages, images (trigger URL)