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Pull request #1830: feature/DEV-3726-7.0-D. Added Zabbix agent/agent 2 service startup type command-line option to win_msi.md.

Merge in WEB/documentation from feature/DEV-3726-7.0-D to release/7.0

* commit '831b2b8c5f4c912db19ce2dc670a89028cdad5c3':
  [DEV-3726] automatic startup can be delayed or not delayed
  [DEV-3726] matched "Upgrade notes" title with "What's new" title
  [DEV-3726] mentioned STARTUPTYPE parameter for more clarity
  [DEV-3726] default startup type for MSI agent/agent2 on Windows Server 2008/Vista and later versions is now `delayed`
  [DEV-3726] added Zabbix agent/agent 2 service startup type command-line option to win_msi.md