website: remove unecessary quotes

Author: findkim

website/archive.erb

@@ -10,7 +10,7 @@
       </li>
 
       <li<%= sidebar_current("docs-archive-datasource") %>>
-      <a href="#">"Data Sources"</a>
+      <a href="#">Data Sources</a>
         <ul class="nav nav-visible">
           <li<%= sidebar_current("docs-archive-datasource-archive-file") %>>
             <a href="/docs/providers/archive/d/archive_file.html">archive_file</a>