Depends on where it's located. Let's say it's in Anotatzailea/AnotatzaileaBundle/Resources/views/example.html.twig; then you would include it like this:
Anotatzailea/AnotatzaileaBundle/Resources/views/example.html.twig
{% include 'AnotatzaileaAnotatzaileaBundle::example.html.twig' %}