Add cash back to point of sale use case.
--- a/latest/use-cases/index.html Fri May 22 22:05:08 2015 -0400
+++ b/latest/use-cases/index.html Fri May 22 23:20:00 2015 -0400
@@ -808,8 +808,8 @@
<dt>Point of Sale Kiosk</dt>
<dd>
Cory shops for groceries at his local ChowMart, scans his loyalty card and
-all of the items he wants to <a>purchase</a> at the automated kiosk, and is
-presented with a total amount.
+all of the items he wants to <a>purchase</a> at the automated kiosk, requests
+a cash back amount, and is presented with a total amount.
</dd>
<dt>Goals</dt>
<dd>