adding anchor link

examples/terms-modal-banner-s3/webassets/modal.html

@@ -130,7 +130,10 @@
           accept: "application/json",
           "cache-control": "no-cache",
           pragma: "no-cache",
-          //'authorization': token //Uncomment this line if you are using an authorization token
+          // 'authorization': token //Uncomment this line if you are using an authorization token
+          // to learn more see the important note about adding authentication here:
+          // https://developers.miro.com/docs/display-bannermodal-on-a-miro-board-using-aws-s3#important
+          //
         };
 
         const reqOptions = {