Enhance migration note

site/content/docs/5.3/migration.md

@@ -24,7 +24,7 @@ toc: true
   - <span class="badge text-bg-success">New</span> X social button.
 
 - **Orange navbar**
-  - <span class="badge text-bg-warning">Warning</span> We checked all images for accessibility: in your project, you should pay attention that the user avatar in the navbar has a correct label, depending on its context, for example "Access to your account".
+  - <span class="badge text-bg-warning">Warning</span> The markup has been revised to utilize an empty `alt` attribute and eliminate the `role="img"`, as a placeholder image is displayed in the navbar in our documentation. You should customize the `alt` attribute for the avatar to align with the context of your website. For instance, it might be appropriate to use "Access to your account" in certain situations.
 
 ### Docs