Updates Regional Services limitations (#19380)

Author: angelampcosta

src/content/docs/data-localization/limitations.mdx

@@ -38,7 +38,7 @@ The following features and protocols are not supported by Regional Services and
 
 Since Regional Services leverages Spectrum in the background, [Spectrum limitations](/spectrum/reference/limitations/) apply.
 
-Regional Services does not apply to [Subrequests](/workers/platform/limits/#subrequests).
+Regional Services does not apply to [Subrequests](/workers/platform/limits/#subrequests). Regional Services operates on your hostname's IPs. We recommend using [DNSSEC](/learning-paths/application-security/default-traffic-security/dnssec/) and/or [DNS over HTTPS](/1.1.1.1/encryption/dns-over-https/) to ensure that DNS responses are secure and correct.
 
 ## Customer Metadata Boundary