Update de.html

Remove trailing slash on the English selection to remove 404 when navigating from Deutsch -> English

Author: AndroidKitKat

doctrine/de.html

@@ -34,7 +34,7 @@ <h1>Die Rails-Doktrin.</h1>
           <div class="language__options">
             <ul>
               <li lang="en">
-                <a href="/doctrine/"><span>English</span></a>
+                <a href="/doctrine"><span>English</span></a>
               </li>
               <li lang="es">
                 <a href="/doctrine/es"><span>Español</span></a>