Fix missing document argument when calling check popover validity within hide popover algorithm

Author: lukewarlow

source

@@ -91567,7 +91567,7 @@ dictionary <dfn dictionary>DragEventInit</dfn> : <span>MouseEventInit</span> {
 
      <li>
       <p>If the result of running <span>check popover validity</span> given <var>element</var>,
-      true, and <var>throwExceptions</var> is false, then run <var>cleanupSteps</var> and
+      true, <var>throwExceptions</var>, and null is false, then run <var>cleanupSteps</var> and
       return.</p>
 
       <p class="note"><span>Check popover validity</span> is called again because running <span