Link to Symfony Module from Use Cases menu

* Linking to Symfony Module

* Update for.html

Author: ThomasLandauer

_includes/for.html

@@ -1,6 +1,6 @@
 <div class="row casestudy">
   <div class="col-sm-4">
-    <a href="/for/symfony" class="item img-thumbnail bg-white item--symfony">
+    <a href="/docs/modules/Symfony" class="item img-thumbnail bg-white item--symfony">
       <div>
         <img src="/images/frameworks/symfony.svg" alt="Symfony">
         <h4>Symfony</h4>