Request to add ra_dns option to the dns/dhcp documentation

Request for someone to update the DNS/DHCP documentation found here:

Please add documentation for the ra_dns option.
It's extremely useful for certain situations like if you don't want to announce any DNS servers via RAs (RDNSS) using odhcpd.

I had to look at the source to actually find this option

**search for ra_dns

And I can confirm that setting
option ra_dns '0'
does in fact work.
Unfortunately, there's zero documentation on this feature.

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Updated the related pages according to the upstream documentation.

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