This change makes a few small improvements to the look of the review detail

generally (and review boxes in particular). I'm planning on doing a somewhat

more invasive clean-up like I did to the review request box, but that will come

later.
The changes herein are:

Removal of the 0.5em margin around the review/changedesc boxes, which was so

  small as to be unnoticable (except when I added another full-width box that

  didn't match the width of the review request box).
Cleanup of the bottom margin of the page to avoid extra space.
Tweaking of margins and padding to make it so the expand/collapse buttons had

  the same amount of spacing on both review and changedesc boxes.
Tweaking of spacing for collapsed boxes so that there wasn't any extra height

  that didn't need to be there.

Looked at the page in both desktop and mobile mode. Checked that everything

changed looked correct.