Although it may seem counterintuitive at first, in very limited cases it's
better to remove improper semantics (this is not a tabular data table) in
order to reduce noise for screen reader users and simplify all the things.
Also improves headings to better separate sections.
Fixes#34780.
Built from https://develop.svn.wordpress.org/trunk@36477
git-svn-id: http://core.svn.wordpress.org/trunk@36444 1a063a9b-81f0-0310-95a4-ce76da25c4cd