documentation

Pull request #800: feature/typo-report-305-7.0-D Doc (6.4) update for incremental configuration sync adjusted for 7.0.

Merge in WEB/documentation from feature/typo-report-305-7.0-D to release/7.0

* commit '84388fdfe676f2edbeeece19cbfec7a2542becf6':
  Updated description for agent parameter `RefreshActiveChecks`
  [ZBXNEXT-7852] Doc (6.4) update for incremental configuration sync adjusted for 7.0