Fix URL linking error

Re #1215

sections/webappapis.include

@@ -116,7 +116,7 @@
   :: A <a>URL record</a> that represents the location of the resource with which the
       <a>environment</a> is associated.
       <p class="note">In the case of an <a>environment settings object</a>, this URL might be
-      distinct from the <a>environment settings object</a>'s <a>responsible document</a>'s <a>URL</a>, due to mechanisms such as
+      distinct from the <a>environment settings object</a>'s <a>responsible document</a>'s <a for="/">URL</a>, due to mechanisms such as
       <code>history.pushState()</code>.</p>
 
   : A <a>target browsing context</a>
@@ -330,7 +330,7 @@
   asynchronously complete with either null (on failure) or a new <a>classic script</a>
   (on success).
 
-  1. Let <var>request</var> be a new <a>request</a> whose <a>url</a> is <var>url</var>, 
+  1. Let <var>request</var> be a new <a>request</a> whose <a for="/">url</a> is <var>url</var>, 
       <a>client</a> is <var>fetch client settings object</var>, <a>destination</a> is <var>destination</var>,
        <a>mode</a> is "<code>same-origin</code>", <a>credentials mode</a> is "<code>same-origin</code>",
        <a>parser metadata</a> is "<code>not parser-inserted</code>", and whose
@@ -432,7 +432,7 @@
   4. Create an entry in <var>module map</var> with key <var>url</var> and value
       "<code>fetching</code>".
   5. Let <var>request</var> be a new <a>request</a> whose
-      <a>url</a> is <var>url</var>, <a>destination</a> is <var>destination</var>, <a>mode</a> is "<code>cors</code>", 
+      <a for="/">url</a> is <var>url</var>, <a>destination</a> is <var>destination</var>, <a>mode</a> is "<code>cors</code>", 
       <a>referrer</a> is <var>referrer</var>, and <a>client</a> is <var>fetch client settings
       object</var>. <a>Set up the module script request</a> given <var>request</var> and
       <var>options</var>.