Merge pull request #39596 from apinnick/revert-legacy-version

Revert MTC legacy operator version number

Author: apinnick

modules/common-attributes.adoc

@@ -43,4 +43,4 @@ endif::[]
 :mtc-full: Migration Toolkit for Containers
 :mtc-version: 1.6
 :mtc-legacy-version: 1.5
-:mtc-legacy-version-z: 1.5.3
+:mtc-legacy-version-z: 1.5.1