doc: improve comment description

Author: JoshuaHungDinh

src/resources/admin-notices.js

@@ -68,7 +68,9 @@
         const location = $notice.data(locationAttribute);
 
         if (location === 'below_header') {
-        // Place after the page action element (e.g., "Add Plugin" on Plugins page) if it exists, otherwise after <h1>.
+        // Place notice after the page action element (e.g., "Add Plugin" on the Plugins page) if it exists; 
+        // otherwise, insert it after the <h1>. On some pages, placing the notice directly after the <h1> 
+        // can cause it to appear between the header and its action button, leading to layout issues.
         const $pageTitleAction = $('a.page-title-action');
         if ($pageTitleAction.length) {
             $notice.insertAfter($pageTitleAction);