Add API ref guideline for examples
Add API ref guideline for examples

Add guideline for JSON request/response body examples
in the API reference.

Change-Id: I2dcc2fc1a16cc5dcba7879518a2b101df3576304

mikalstill/nova,mikalstill/nova,openstack/nova,mahak/nova,rahulunair/nova,klmitch/nova,mikalstill/nova,mahak/nova,klmitch/nova,rahulunair/nova,klmitch/nova,openstack/nova,rahulunair/nova,klmitch/nova,mahak/nova,openstack/nova