Merge pull request #39665 from apinnick/update-mtc-legacy-version

Update version number of legacy MTC operator for 1.5.3

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: 1.5.1
+:mtc-legacy-version-z: 1.5.3