[AMENDMENT] Add dns provider link in web browsing section

Location

https://digital-defense.io/checklist/web-browsing/

Amendments

https://adguard-dns.io/kb/general/dns-providers/ add this link in this section -> Use DNS-over-HTTPS of https://digital-defense.io/checklist/web-browsing/ This will help people get idea about different types of dns providers that are actually available in market and what they exactly provide and what exact URL's they have to use for getting there DOH advantage, overall every info they can get there so i think it is good addition to that section.

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