Bug 16042 - Missing closing quote in checkin template

 Bug 16042 - Missing closing quote in checkin template

A missing quotation mark breaks the display of multiple messages during
checking. This patch adds the missing quote.

To test, apply the patch and locate an item which is on hold and is not
checked out.

 - Check in the item.
 - Confirm that both the hold notification and the "Not checked out"
   alert look correct.
 - For extra credit, validate the page and confirm that there are no
   errors related to broken markup.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>