LP1038240 - Patron editor field documentation does not display text

Changed the legend tag to have a closing tag.
Also modified the css id uedit-help-div, to add a top margin so
it does not overlap the save div.

Signed-off-by: Kyle Tomita <tomitakyle@gmail.com>
Signed-off-by: Bill Erickson <berick@esilibrary.com>