update friends-list example

Author: robdodson

1.0/elements/docs-menu.html

@@ -56,7 +56,7 @@
     </core-item>
 
     <core-item label="Articles" icon="book">
-      <a href="/{{versionPrefix}}/articles"></a>
+      <a href="/{{versionPrefix}}/articles/"></a>
     </core-item>
 
     <core-item label="Catalog" icon="polymer">

1.0/index.md

@@ -186,9 +186,9 @@ title: Welcome
 <dom-module id="friend-list">
   <link rel="import" type="css" href="friend-list.css">
   <template>
-    <firebase-element data="{{data}}"
+    <firebase-collection data="{{data}}"
                       location="https://users1.firebaseio.com/users">
-    </firebase-element>
+    </firebase-collection>
     <template is="dom-repeat" items="{{data}}">
       <contact-card starred="{{item.starred}}">
         <img src="{{item.img}}" alt="{{item.name}}">

1.0/samples/homepage/friend-list/friend-list.html

@@ -1,12 +1,12 @@
-<link rel="import" href="../../components/firebase-element/firebase-element.html">
+<link rel="import" href="../../components/firebase-element/firebase-collection.html">
 <link rel="import" href="../contact-card/contact-card.html">
 
 <dom-module id="friend-list">
   <link rel="import" type="css" href="friend-list.css">
   <template>
-    <firebase-element data="{{data}}"
+    <firebase-collection data="{{data}}"
                       location="https://users1.firebaseio.com/users">
-    </firebase-element>
+    </firebase-collection>
     <template is="dom-repeat" items="{{data}}">
       <contact-card starred="{{item.starred}}">
         <img src="{{item.img}}" alt="{{item.name}}">