documentation

Pull request #532: [ZBXNEXT-7122] Updates on housekeeping (TSDB) configuration.

Merge in WEB/documentation from feature/ZBXNEXT-7122-6.4-D to release/6.4

* commit 'e6f067ae61949a143c387683b2a16469371e4eea':
  [ZBXNEXT-7122] Updated blockID
  [ZBXNEXT-7122] Removed updates from "What's new", "Upgrade notes"
  [ZBXNEXT-7122] Updated "What's new", "Upgrade notes"
  [ZBXNEXT-7122] Updated "What's new", "Upgrade notes"
  [ZBXNEXT-7122] Updated conjunction in "Sys. info." page
  [ZBXNEXT-7122] Updated formatting
  [ZBXNEXT-7122] Updated formatting
  [ZBXNEXT-7122] Updates on housekeeping (TSDB) configuration