Unset the filter tips link under comments form in Drupal 8

unset_comment_tips.info.yml

name: Remove Comment Tips
type: module
description: Remove the comment tips link beneath comment forms in Drupal 8.
core: 8.x
version: '8.x-1.0'

unset_comment_tips.module

<?php

/**
 * Implements hook_form_alter().
 */
function unset_comment_tips_form_comment_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
  $form['comment_body']['#after_build'][] = '_unset_comment_tips_configure_comment_form';

}

/**
 * Unset the filter tips link underneath the comment form.
 */
function _unset_comment_tips_configure_comment_form(&$form) {
  if(isset($form['widget'][0]['format']['help'])) {
    unset($form['widget'][0]['format']['help']);
  }
  return $form;
}

Drupal 8.5.2 throws:
Warning: Parameter 1 to _ey_core_configure_comment_form() expected to be a reference, value given in Drupal\Core\Form\FormBuilder->doBuildForm() (line 1067)

You have to remove reference from $form in _unset_comment_tips_configure_comment_form function.

But thanks anyway, I've moved this solution to my base module :)