doc: fix typo in cjs example of util.styleText

`errorMessage` needs to be printed instead of
`successMessage` in console.error(). ESM example is
only fixed in previous PR.

Refs: nodejs#56720

doc/api/util.md

@@ -1988,7 +1988,7 @@ const errorMessage = styleText(
   // Validate if process.stderr has TTY
   { stream: stderr },
 );
-console.error(successMessage);
+console.error(errorMessage);
 ```
 
 `util.inspect.colors` also provides text formats such as `italic`, and