trivial change to contributing instructions
trivial change to contributing instructions

We need a trivial change to trigger documentation publishing. This
makes the wording of the contributor instructions a little more welcoming.

Change-Id: If46d7679542ada430b7e67a29b0cbf299c9147d9
Signed-off-by: Doug Hellmann <0798ebecfb7bc4dfb9d0445c2fa030eb64e1fa1c@doughellmann.com>

openstack/reno