fix luna link

Signed-off-by: Christopher Guindon <chris.guindon@eclipse.org>
diff --git a/content/en_index.php b/content/en_index.php
index 7d12a52..dac97f2 100644
--- a/content/en_index.php
+++ b/content/en_index.php
@@ -30,7 +30,7 @@
 <div class="container" style="padding-top: 1.5em;">
   <div class="col-md-24" style="padding-left: 0;">
     <div class="alert alert-danger" role="alert">
-      <a href="https://projects.eclipse.org/releases/lunaindigo">Luna</a> is
+      <a href="https://projects.eclipse.org/releases/luna">Luna</a> is
       a past version of Eclipse. Please visit our <a href="/downloads/">download</a>
       page for the latest version of Eclipse.
     </div>