configure: minor change to get tab completion to work

git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@2811 fd59a12c-fef9-0310-b244-a6a79926bd2f

configure.ac

@@ -224,7 +224,7 @@ AC_ARG_ENABLE([fatal-warnings],
 	[ default="no" ])
 
 AC_ARG_ENABLE([debug],
-	[ --enable-debug          : enable debug build. ],
+	[  --enable-debug          : enable debug build. ],
 	[ default="no" ])
 
 AC_ARG_ENABLE([coverage],