replace u\2013 char with dash

unicode char causes problems with maven build.

backport:none

closes-bug: #1246569

Change-Id: I3aa5c2debaed03acd2c2fb8d4e7c30738d35f4f3

doc/source/devref/auth.rst

@@ -213,7 +213,7 @@ Establishing declarative semantics for individual API calls will allow the cloud
 See related work within the Infrastructure 2.0 working group for more information on how the IMF Metadata specification could be utilized to manage registration of these vendors and their C&A credentials.
 
 
-Dirty Cloud – Hybrid Data Centers
+Dirty Cloud - Hybrid Data Centers
 ---------------------------------
 
 *	CloudAudit bridge interfaces