documentation

Pull request #1527: feature/ZBX-23146-7.0-D. DB upgrade to double precision.

Merge in WEB/documentation from feature/ZBX-23146-7.0-D to release/7.0

* commit '3afd16458e5bd2c3262912f605a3bd0f5ef82bac':
  [ZBX-23146] Refined wording
  [ZBX-23146] Refined wording
  [ZBX-23146] Updated Zabbix version & blockIDs
  [ZBX-23146] trends_old DB table should be dropped for TimescaleDB
  [ZBX-23146] DB upgrade to double precision