Video for calculated fields

Author: stitenko

_includes/docs/user-guide/calculated-fields/index.md

@@ -851,7 +851,7 @@ It covers the core concepts, supported calculation types, and practical examples
  
 <div id="video">  
     <div id="video_wrapper">
-        <iframe src="https://www.youtube.com/embed/wBUcWMSH4QI" frameborder="0" allowfullscreen></iframe>
+        <iframe referrerpolicy="strict-origin-when-cross-origin" src="https://www.youtube.com/embed/wBUcWMSH4QI" frameborder="0" allowfullscreen></iframe>
     </div>
 </div>