Update style.rst

"ask" signature expects a string as second parameter

public function ask(string $question, string $default = null, callable $validator = null): mixed

Author: lougaou

console/style.rst

@@ -286,7 +286,7 @@ User Input Methods
     In case you need to validate the given value, pass a callback validator as
     the third argument::
 
-        $io->ask('Number of workers to start', 1, function ($number) {
+        $io->ask('Number of workers to start', '1', function ($number) {
             if (!is_numeric($number)) {
                 throw new \RuntimeException('You must type a number.');
             }