Disambiguate "id" and "status" exports (#349)

Follow-up to #348.

Author: foolip

index.bs

@@ -2563,11 +2563,11 @@ The progress of navigation is communicated using an immutable <dfn export>WebDri
 navigation status</dfn> struct, which has the following items:
 
 <dl>
-  <dt><dfn export id="navigation-status-id">id</dfn></dt>
+  <dt><dfn export for="WebDriver navigation status" id="navigation-status-id">id</dfn></dt>
   <dd>The [=navigation id=] for the navigation, or null when the navigation is
   canceled before making progress.</dd>
 
-  <dt><dfn export id="navigation-status-status">status</dfn></dt>
+  <dt><dfn export for="WebDriver navigation status" id="navigation-status-status">status</dfn></dt>
     <dd>A status code that is either
       "<dfn export id="navigation-status-canceled"><code>canceled</code></dfn>",
       "<dfn export id="navigation-status-pending"><code>pending</code></dfn>", or