documentation

Pull request #2490: feature/DEV-4191-7.2-D. zabbix-sql-scripts > zabbix/sql-scripts; added DB upgrade to PK step.

Merge in WEB/documentation from feature/DEV-4191-7.2-D to release/7.2

* commit '088dffe48188daa8f2e1c74e061804ccd75e2510':
  [DEV-4191] added DB upgrade to PK step (refined wording)
  [DEV-4191] added DB upgrade to PK step
  [DEV-4191, ZBX-24272] zabbix-sql-scripts > zabbix/sql-scripts