Updated openstack/openstack
Project: openstack/heat  7a34e8cf9cf2adccffbe8a4582f966159d653e3c

Correct example syntax and whitespace

Corrects some examples and remove trailing whitespace in
the Heat Resource Plug-in Development Guide
page (pluginguide.html)

Closes-Bug: 1350503

Change-Id: I34b142e950b9a4588b415d44274732d835cfd8f4