Force code sample to be treated as python

Change-Id: I3340397e0b263973aa8387d77d50cc1cb4756634
Closes-Bug: #1374477
Workflow documentation is now in infra-manual

Replace URLs for workflow documentation to appropriate parts of the
OpenStack Project Infrastructure Manual.

Change-Id: I1121751e84a99c7a97beb8ab122494558a7fb71b