Fixes various documentation typos in Murano automated tests description.
Fixes various documentation typos in Murano automated tests description.

The docs located at
http://docs.openstack.org/developer/murano/appendix/articles/test_docs.html
contain various typos; these have been corrected.

Change-Id: Id2b519640ce8f0dd234fcf253a60f620ee23ec62

openstack/murano,openstack/murano