Fix some minor HTML issues

* Unclosed <strong> tag in some messages
* Having the "Step 1" link from the preview page run into the last
  paragraph in a way that didn't look quite like. For now make it
  into a list, although perhaps these links should be gotten rid
  of, and instead link it directly in the message.

Change-Id: I42045f3279965915b1355e3182687158fde953b8
Merge "Fix some minor HTML issues"