Fix the issues reported by phpcs

Above errors has been fixed.

* @param array $form
+ * The Form array.
* @param \Drupal\Core\Form\FormStateInterface $form_state
+ * The For state.

Form does not need to be capitalized since it is not a proper noun nor at the beginning of the sentence. The same is true for For, which is also a typo.

+ * The Form's pathauto_preview value.

That is another word that is not a proper noun nor at the beginning of the sentence. That description does not make clear what the returned value is.

I didn't find much AJAX callbacks that are implemented as functions, but the following has a different documentation comment, probably because, like form submission and validation handlers, their parameters are known.

/**
 * Ajax callback that returns the form element.
 */
function form_test_tableselect_ajax_callback($form, FormStateInterface $form_state) {
  return $form['tableselect'];
}

Improve the typo and grammar in this patch.

  * Ajax callback that generates the URL-alias for an entity.
  *
  * @param array $form
+ *   The form array.
  * @param \Drupal\Core\Form\FormStateInterface $form_state
+ *   The form state.
  *
  * @return mixed
+ *   The pathauto_preview value of the form.
  */

An AJAX callback does not need its parameters nor its return value described.

-  // moment and the pathauto generator requires that the entity has an ID>
+  // moment and the pathauto generator requires that the entity has an ID>.

The > after ID is a typo. It needs to be removed.

Addressed #5feedback.

1. An AJAX callback does not need its parameters nor its return value described : Fixed
2. The > after ID is a typo. It needs to be removed. : Fixed

Hi, reviewed the patch #6, applied cleanly , fixes all the reported phpcs errors and addresses the comments in #5.

I've applied MR !1 and no phpcs issues found.