Fix some HTML tag mismatches and other glitches. These are minor, and don't appear to cause browsers any problems, but for the sake of correctness:
* A closing td which should be a closing div.
* A closing h3 for a corresponding h6
* Two tables with `<thead>` tag and missing `<tr>` around the `<th>` headings.
test change for thead fix
This makes it easier to navigate around these pages. Since each tab
corresponds to a given controller, this makes the selection of active
tabs straightforward.
