Adds link to a docs reference in homepage

index.html

@@ -93,7 +93,7 @@ <h4>Custom Status Classes</h4>
             <br><br>
 
             <h4>Promise Values</h4>
-            <p>The directive exposes several scope properties to the button's content (see docs). You can use them to give extra info on the promise's status.</p>
+            <p>The directive exposes several scope properties to the button's content (<a href="#scope">see docs</a>). You can use them to give extra info on the promise's status.</p>
             <br>
             <div class="container-fluid">
               <div class="row">