#176 Fix data file links in index.html to use .yamlld extension

Author: anatoly-scherbakov

index.html

@@ -363,8 +363,8 @@ <h2>Introduction</h2>
 
     <div class="ednote">
       See YAML-LD description of this spec at
-      <a href="data/spec.yaml" target="_blank">
-        <code>spec.yaml</code>
+      <a href="data/spec.yamlld" target="_blank">
+        <code>spec.yamlld</code>
       </a>.
     </div>
 
@@ -563,8 +563,8 @@ <h2>Namespace Prefixes</h2>
 
     <div class="ednote">
       See YAML-LD version of this table at
-      <a href="data/namespace-prefixes.yaml" target="_blank">
-        <code>namespace-prefixes.yaml</code>
+      <a href="data/namespace-prefixes.yamlld" target="_blank">
+        <code>namespace-prefixes.yamlld</code>
       </a>.
     </div>
 
@@ -772,8 +772,8 @@ <h3>JSON vs YAML comparison</h3>
 
       <div class="ednote">
         See YAML-LD version of this table at
-        <a href="data/json-vs-yaml.yaml" target="_blank">
-          <code>json-vs-yaml.yaml</code>
+        <a href="data/json-vs-yaml.yamlld" target="_blank">
+          <code>json-vs-yaml.yamlld</code>
         </a>.
     </div>
     </section>