Fixing trigger-parameterized-builds example

The example for the trigger-parameterized-builds functionality is
incorrect.  A dash is needed before the project in the yaml so the
code knows that project is used multiple times.  I also added the
predefined-parameters value to the example to show how that is used,
 because it took me a while to figure out

Change-Id: Ib6c5ffb18c213ccc1396edd1264edbf4c28ff651
Reviewed-on: https://review.openstack.org/21129
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Khai Do <zaro0508@gmail.com>
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins