Changing the WordPress Register Password Hint Text via a Filter

/**
 * Change the WordPress password hint text. Note: This won't change any password checking functionality.
 * Add this code to your child theme functions.php or via a custom plugin.
 */

function yh_change_password_hint( $hint_text ) {
  return "Hint: The password should be at least nine characters long. To make it stronger, use upper and lower case letters, numbers, and symbols like (!#@?$%^&).";
}
add_filter( 'password_hint', 'yh_change_password_hint', 10, 1 );