ezcontent-8.x-dev/modules/ezcontent_user/ezcontent_user.module

<?php

/**
 * @file
 * Module file for ezcontent_user.
 */

use Drupal\Core\Form\FormStateInterface;

/**
 * Implements hook_form_alter().
 */
function ezcontent_user_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if ($form_id == 'user_register_form') {
    $moduleHandler = \Drupal::service('module_handler');
    if ($moduleHandler->moduleExists('email_registration')) {
      $form['account']['mail']['#description'] = t('We will send one time login link on this email id to set your password.');
    }
  }
}