Link to promise spec.

Closes #37.

Author: mgiuca

index.html

@@ -115,7 +115,8 @@ <h4>
             <var>data</var>, run the following steps:
           </p>
           <ol>
-            <li>Let <var>p</var> be a newly created promise.
+            <li>Let <var>p</var> be <a data-cite=
+            "!promises-guide#a-new-promise">a new promise</a>.
             </li>
             <li>If <var>data</var>'s <a for="ShareData">url</a> member is
             <a data-cite="!WEBIDL#dfn-present">present</a>: