Add note clarifying that credentialSubject.id is not used.

Co-authored-by: Dave Longley <[email protected]>

Author: jandrieu

index.html

@@ -733,6 +733,13 @@ <h3>BitstringStatusListEntry</h3>
 credential.
         </p>
 
+        <p class="note">
+It is important to note that `statusListIndex` is the only link between
+the [=verifiable credential=] and its status in the list. Other
+properties such as `credentialSubject.id` are not used for
+this purpose.
+        </p>
+
         <pre class="example nohighlight"
              title="Example StatusListCredential using more complex entries">
 {