Update grammar in 410 Gone HTML template

Author: Kristan Kenney

install/deb/templates/web/skel/document_errors/410.html

@@ -102,7 +102,7 @@
             </div>
             <h1 class="animated fadeIn">Resource is Gone</h1>
             <div class="description-text animated fadeIn delay-1s">
-                <p>Oops! Requested resource is no longer available.</p>
+                <p>Oops! The requested resource is no longer available.</p>
                 <p>Please check the address and try again.</p>
                 <section class="footer"><strong>Error Code:</strong> 410</section>
             </div>