doc: fix lexical sorting of bottom-references in dns doc

The links are sorted in lexical order except for the two RFC links which
are reversed. Fix that.

PR-URL: #33987
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/dns.md

@@ -1199,6 +1199,6 @@ uses. For instance, _they do not use the configuration from `/etc/hosts`_.
 [DNS error codes]: #dns_error_codes
 [Domain Name System (DNS)]: https://en.wikipedia.org/wiki/Domain_Name_System
 [Implementation considerations section]: #dns_implementation_considerations
-[RFC 8482]: https://tools.ietf.org/html/rfc8482
 [RFC 5952]: https://tools.ietf.org/html/rfc5952#section-6
+[RFC 8482]: https://tools.ietf.org/html/rfc8482
 [supported `getaddrinfo` flags]: #dns_supported_getaddrinfo_flags