add change log

ROCKY/CFG/subscription-manager.cfg

@@ -101,10 +101,17 @@ spec_change {
     replace: "an"
     n: -1
   }
+
   search_and_replace {
     any: true
     find: "a Enterprise Linux"
     replace: "a"
     n: -1
   }
+
+  changelog {
+    author_name: "Release Engineering"
+    author_email: "releng@rockylinux.org"
+    message: "Remove Red Hat specific references and certificates"
+  }
 }