Referencing this page: https://openwrt.org/docs/guide-user/base-system/dhcp_configuration?s[]=dhcp&s[]=option#dhcp_options
I think it would be helpful to add two things here:
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That the user may repeat options on separate lines rather than squishing them all together on a single line.
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That option 23 must also be used for announce ipv6 DNS servers
Screenshot for reference.