fix glossary link in header-content.hbs

Author: polandll

src/partials/header-content.hbs

@@ -28,7 +28,7 @@
       <div class="navbar-end">
          <div class="doc-link">
           <ul id="ds_sites_list">
-            <li><a href="/en/glossary/doc" target="_blank">Glossary</a></li>
+            <li><a href="/en/glossary/docs" target="_blank">Glossary</a></li>
             <li><a href="https://support.datastax.com/" target="_blank">Support</a></li>
             <li><a href="https://downloads.datastax.com/" target="_blank">Downloads</a></li>
             <li><a href="https://www.datastax.com/" target="_self">DataStax Home</a></li>
@@ -58,4 +58,4 @@
       </div>
     </div>
   </nav>
-</header>
+</header>