Fix typo

roles/matrix-etherpad/tasks/setup_uninstall.yml

@@ -29,7 +29,7 @@
     path: "{{ matrix_etherpad_base_path }}"
     state: absent
 
-- name: Ensure Dimension Docker image doesn't exist
+- name: Ensure Etherpad Docker image doesn't exist
   docker_image:
     name: "{{ matrix_etherpad_docker_image }}"
     state: absent