Updated openstack/openstack
Project: openstack/python-novaclient  d46e206ba335b7fc9d98894fa5f7082695031c2a

Fix the section name in CONTRIBUTING.rst

The name of the section "If you're developer, start here"
has changed in the wiki, now is "If you're a developer".
This commit updates it to correctly refer to the
proper section.

Change-Id: I16fc339292ac5766530f003770bee133170bed67