fix 711 identifier internal slot contains credID

index.bs

@@ -590,9 +590,11 @@ that are returned to the caller when a new credential is created, or a new asser
         "{{Credential/[[discovery]]/remote}}".
 
     :   <dfn>\[[identifier]]</dfn>
-    ::  This [=internal slot=] contains an identifier for the credential, chosen by the platform with help from the
-        authenticator. This identifier is used to look up credentials for use, and is therefore expected to be globally unique
-        with high probability across all credentials of the same type, across all authenticators. This API does not constrain
+    ::  This [=internal slot=] contains the [=credential ID=], chosen by the platform with help from the authenticator.
+        The [=credential ID=] is used to look up credentials for use, and is therefore expected to be globally unique
+        with high probability across all credentials of the same type, across all authenticators.
+
+        Note: This API does not constrain
         the format or length of this identifier, except that it must be sufficient for the platform to uniquely select a key.
         For example, an authenticator without on-board storage may create identifiers containing a [=credential private key=]
         wrapped with a symmetric key that is burned into the authenticator.