Fix TODO for calling "on navigate callback" (#162)

spec.bs

@@ -2739,6 +2739,8 @@ CORP violation report=] algorithm, as leaving it unfenced may cause a privacy le
 
       1. Set |url| to |config|'s [=fenced frame config/mapped url=]'s [=mapped url/value=].
 
+      1. Run steps in |config|'s [=fenced frame config/on navigate callback=].
+
   <wpt>
     /fenced-frame/frame-navigation.https.html
   </wpt>
@@ -2837,9 +2839,6 @@ content in the <{fencedframe}> or its embedder, exactly one of two things will h
   :: |automaticBeaconsAllowed|.
 </div>
 
-<span class=XXX>TODO: Call the [=fenced frame config instance/on navigate callback=] at the
-appropriate time.</span>
-
 <h4 id=bcg-swap>Browsing context group swap</h4>
 
 When the embedder of a <{fencedframe}> initiates navigations inside the frame, we must perform a