Update hook_civicrm_entityTypes.md

Merge Request Description: This merge request corrects a typo in the hook_civicrm_entityTypes documentation where hook_civicrm_apiWrappers() was incorrectly referenced alongside hook_civicrm_entityTypes(). The incorrect mention of hook_civicrm_apiWrappers() has been removed to ensure accuracy in the documentation for hook_civicrm_entityTypes() within CiviCRM.

Additionally, the provided code snippet:

function apilogging_civicrm_entityTypes(&$entityTypes) {
  $entityTypes['CRM_Contact_DAO_Contact']['fields_callback'][]
    = function ($class, &$fields) {
      unset($fields['created_date']['export']);
 };

has been found to cause an error, as detailed in this issue. Upon testing with my custom extension and the latest CiviCRM setup, I confirmed the issue persists. Therefore, I have updated the code to the following, which resolves the error and functions correctly:

function apilogging_civicrm_entityTypes(&$entityTypes) {
  $entityTypes['Contact']['fields_callback'][]
    = function ($class, &$fields) {
      unset($fields['created_date']['export']);
 };

Please review these changes. Thank you.