Adding DocSearch headers to meta

source/_templates/layout.html

@@ -18,6 +18,8 @@
       })(window,document,'script','dataLayer','GTM-TWQNHTD');
    </script>
 
+   <meta name="docsearch:tags" content="{{ doc_platform }}"/>
+
    <!-- Google Analytics -->
    <script>
       (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){