Remove outdated URL

Now the role use ansible.mariadb collection.

README.md

@@ -227,8 +227,6 @@ mariadb_databases: []
 #     replicate: true|false
 ```
 
-See: <https://docs.ansible.com/ansible/latest/collections/community/mysql/mysql_db_module.html>
-
 ### User management
 
 ```yaml
@@ -240,8 +238,6 @@ mariadb_users: []
 #     state: present|absent
 ```
 
-See: <https://docs.ansible.com/ansible/latest/collections/community/mysql/mysql_user_module.html>
-
 ### Replication (optional)
 
 Replication is only enabled if `mariadb_replication_role` has a value (`primary` or