Update doc to untruncated notifications

As part of solving #7249 (closed) the screenshots of notifications that we have on /doc/get/verify_the_iso_image_using_gnome need to be updated and the <div class="bug"> removed.

Parent Task: #7249 (closed)

Original created by @sajolida on 9610 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information