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: #56720
PR-URL: #56769
Reviewed-By: Ulises Gascón <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Jason Zhang <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: deokjinkim

doc/api/util.md

@@ -1980,7 +1980,7 @@ 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