add Notes to RP verification steps linking to DPK extension verificat…

…ion procedures

index.bs

@@ -4609,6 +4609,8 @@ In order to perform a [=registration ceremony=], the [=[RP]=] MUST proceed as fo
 
         Note: Since all extensions are OPTIONAL for both the [=client=] and the [=authenticator=], the [=[RP]=] MUST also be
         prepared to handle cases where none or not all of the requested extensions were acted upon.
+
+        Note: The [=devicePubKey=] extension has explicit verification procedures, see [[#sctn-device-publickey-extension-verification-create]].
     </li>
 
 1. Determine the attestation statement format by performing a USASCII case-sensitive match on |fmt| against the set of
@@ -4774,6 +4776,8 @@ a numbered step. If outdented, it (today) is rendered as a bullet in the midst o
 
         Note: Since all extensions are OPTIONAL for both the [=client=] and the [=authenticator=], the [=[RP]=] MUST also be
         prepared to handle cases where none or not all of the requested extensions were acted upon.
+
+        Note: The [=devicePubKey=] extension has explicit verification procedures, see [[#sctn-device-publickey-extension-verification-get]].
     </li>
 
 1. Let |hash| be the result of computing a hash over the |cData| using SHA-256.