doc: fix util.inspect change history

PR-URL: nodejs#35528
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Shelley Vohr <codebytere@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

doc/api/util.md

@@ -450,7 +450,9 @@ stream.write('With ES6');
 <!-- YAML
 added: v0.3.0
 changes:
-  - version: v12.19.0
+  - version:
+    - v14.6.0
+    - v12.19.0
     pr-url: https://github.com/nodejs/node/pull/33690
     description: If `object` is from a different `vm.Context` now, a custom
                  inspection function on it will not receive context-specific