Updated openstack/openstack
Project: openstack/heat  c9f9a214ce2f1a0c9e91c5b6ee128a0ae92a77f9
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Fix a typo in the README for docs

Package `oslo.sphinx` is wronlgy referred to as `oslo-sphinx`.

Change-Id: I15711aa54c82d97b622fbceb821b4aca3315d49c