documentation

Pull request #1812: feature/ZBXNEXT-9150-7.0-D. Added Browser item type.

Merge in WEB/documentation from feature/ZBXNEXT-9150-7.0-D to release/7.0

* commit 'e66fda317e9432977c157e08fbbed2e106a6abb9':
  [ZBXNEXT-9150] moved Browser item JavaScript objects to a separate page
  [ZBXNEXT-9150] post-review update
  [ZBXNEXT-9150] updated formatting
  [ZBXNEXT-9150] updated wording, formatting
  [ZBXNEXT-9150] updated wording, formatting; moved Browser item JavaScript objects to "Additional JavaScript objects" page
  [ZBXNEXT-9150] updated wording
  [ZBXNEXT-9150] added Browser item type
  [ZBXNEXT-9150] added Browser item type