documentation

Pull request #1887: feature/ZBX-24594-7.0-D3: TimescaleDB info updated.

Merge in WEB/documentation from feature/ZBX-24594-7.0-D3 to release/7.0

* commit 'd9a66bfc05b27d14cc5b8b8406817cd13ef76ff3':
  [ZBX-24594] Adjusted upgrade notes
  [ZBX-24594] Adjusted entry
  [ZBX-24594] Removed outdated info
  [ZBX-24594] Adjusted wording
  [ZBX-24594] Removed outdated mentions of TimescaleDB