Don't require user prompt handler notify to match when creating session

This would prevent creating a BiDi session for a browser that already has a HTTP session
with the notify flag set for some prompt handler.

index.html

@@ -10545,11 +10545,7 @@ <h3>User Prompt Handler</h3>
      <li><p>If the <var>requested prompt handler</var>&apos;s [=prompt
      handler configuration/handler=] is not equal to the <a>user
      prompt handler</a>&apos;s [=prompt handler
-     configuration/handler=], or the <var>requested prompt
-     handler</var>&apos;s [=prompt handler configuration/notify=]
-     is not equal to the <a>user prompt
-     handler</a>&apos;s [=prompt handler configuration/handler=],
-     return false.
+     configuration/handler=], return false.
 
     </ol>
    </li>
@@ -10558,6 +10554,12 @@ <h3>User Prompt Handler</h3>
  <li>Return true</li>
 </ol>
 
+<p class="note">This does not check the <var>requested prompt
+handler</var>&apos;s [=prompt handler configuration/notify=] matches
+the [=prompt handler configuration/handler=], because the [=prompt
+handler configuration/notify=] component only affects the [=HTTP
+session=], if any.
+
 <p>To <dfn>update the user prompt handler</dfn> given <var>requested prompt handler</var>:
 
 <ol class=algorithm>