Fix description for "Not exact spelling"
Fix description for "Not exact spelling"

Change the description to "There is a inapt spelling
in the file heat/README.rst(line6).
  'templates, through both an OpenStack-native ReST API and a'.
The word 'ReST' should be spelled as 'REST'."

Change-Id: Ife2a64b9414c8f7ffd22db9d113bbb0f0cad986b
Closes-Bug: #1487265

dims/heat,noironetworks/heat,takeshineshiro/heat,dragorosson/heat,srznew/heat,gonzolino/heat,steveb/heat,cryptickp/heat,noironetworks/heat,jasondunsmore/heat,srznew/heat,cwolferh/heat-scratch,jasondunsmore/heat,miguelgrinberg/heat,cryptickp/heat,maestro-hybrid-cloud/heat,steveb/heat,openstack/heat,pratikmallya/heat,cwolferh/heat-scratch,dragorosson/heat,pratikmallya/heat,takeshineshiro/heat,dims/heat,openstack/heat,miguelgrinberg/heat,gonzolino/heat,maestro-hybrid-cloud/heat