MIG-1419: updating attributes for MTC 1.8.0

Author: anarnold97

_attributes/common-attributes.adoc

@@ -65,8 +65,8 @@ endif::openshift-origin[]
 :launch: image:app-launcher.png[title="Application Launcher"]
 :mtc-short: MTC
 :mtc-full: Migration Toolkit for Containers
-:mtc-version: 1.7
-:mtc-version-z: 1.7.10
+:mtc-version: 1.8
+:mtc-version-z: 1.8.0
 // builds (Valid only in 4.11 and later)
 :builds-v2title: Builds for Red Hat OpenShift
 :builds-v2shortname: OpenShift Builds v2