documentation

Pull request #1254: feature/ZBXNEXT-6986-7.0-D-API: Updates related to audit for LLD rules.

Merge in WEB/documentation from feature/ZBXNEXT-6986-7.0-D-API to release/7.0

* commit '6390a4f1dc36d9f8a9943a82bb55f87410ad2020':
  [ZBXNEXT-6986] Refined note; updated multiple property details
  [ZBXNEXT-6986] Updated `value` property behavior
  [ZBXNEXT-6986] Refined parameter description
  [ZBXNEXT-6986] Updated `formulaid` property behavior
  [ZBXNEXT-6986] FROM "array" (for LLDs) or "array/object", or "object/array of objects" TO "object/array"
  [ZBXNEXT-6986] Deprecated method discoveryrule.copy
  [ZBXNEXT-6986] The "Discard unchanged with heartbeat" preprocessing type does not support LLD macros as parameters
  [ZBXNEXT-6986] JS preprocessing is available for LLD rules