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Pull request #1791: feature/ZBXNEXT-5977-7.0-D. Added Zabbix agent/agent 2 service startup type command-line option.

Merge in WEB/documentation from feature/ZBXNEXT-5977-7.0-D to release/7.0

* commit '9612b01724cd0e782e4c2ec08f25cf53978889b4':
  [ZBXNEXT-5977] restored line breaks
  [ZBXNEXT-5977] moved update to DEV-3726
  [ZBX-21560] updated agent/agent2 default config paths
  [ZBXNEXT-5977] "agent/agent 2" → "Zabbix agent/agent 2"
  [ZBXNEXT-5977] refined wording
  [ZBXNEXT-5977] updated startup-type option formatting
  [ZBXNEXT-5977] clarified Zabbix agent/agent 2 service startup type command-line option
  [ZBXNEXT-5977] refined wording
  [ZBXNEXT-5977] refined new feature entries; added Zabbix agent/agent 2 service startup type command-line option to win_msi.md
  [ZBXNEXT-5977] refined new feature entries
  [ZBXNEXT-5977] refined headings
  [ZBXNEXT-5977] changed "delayed startup" to "delayed start"
  [ZBXNEXT-5977] added Zabbix agent/agent 2 service startup type command-line option