Used strict comparison in docs/ref/csrf.txt's JavaScript.

docs/ref/csrf.txt

@@ -83,12 +83,12 @@ Acquiring the token is straightforward:
     // using jQuery
     function getCookie(name) {
         var cookieValue = null;
-        if (document.cookie && document.cookie != '') {
+        if (document.cookie && document.cookie !== '') {
             var cookies = document.cookie.split(';');
             for (var i = 0; i < cookies.length; i++) {
                 var cookie = jQuery.trim(cookies[i]);
                 // Does this cookie string begin with the name we want?
-                if (cookie.substring(0, name.length + 1) == (name + '=')) {
+                if (cookie.substring(0, name.length + 1) === (name + '=')) {
                     cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                     break;
                 }