documentation

Pull request #365: Updated "Triggers" page.

Merge in WEB/documentation from feature/ZBX-21512-6.4-D to release/6.4

* commit '396b61c29ffe6d17645a4fd7511764739d226ce6':
  [ZBX-21512] Updated block ID's
  [ZBX-21512] Updated "Triggers" page
  [ZBX-21512] Moved new contents in "Triggers" page
  [ZBX-21512] Updated "Triggers" page (suggested updates)