Fix html product-ref.html

tests/samples/schema.org/product-ref.html

@@ -8,8 +8,7 @@
   <div id="product" itemscope itemtype="http://schema.org/Product" itemref="other-product-properties more-properties related_products">
     <span itemprop="brand">ACME</span>
     <span itemprop="name">Executive Anvil</span>
-    <img itemprop="image" src=" anvil_executive.jpg
-    " alt="Executive Anvil logo" />
+    <img itemprop="image" src=" anvil_executive.jpg" alt="Executive Anvil logo"/>
     <span itemprop="description">Sleeker than ACME's Classic Anvil, the
       Executive Anvil is perfect for the business traveler
       looking for something to drop from a height.
@@ -52,7 +51,5 @@
       <img itemprop="image" src="rel-prod-2.jpg">
     </div>
    </div>
-
- </div>
  </body>
 </html>