Fix name of yum_repository task

With [1] the task was converted to a list, which makes the current
task naming misleading, but it was not addressed in [1].

[1] https://review.opendev.org/c/openstack/openstack-ansible-lxc_hosts/+/951574

Change-Id: I57e1572244bff3a6c2e0d7a9e174e94964a286f1
Signed-off-by: Dmitriy Rabotyagov <dmitriy.rabotyagov@cleura.com>

tasks/lxc_install_dnf.yml

@@ -61,7 +61,7 @@
   loop_control:
     label: "{{ item.key }}"
 
-- name: Install the EPEL repository
+- name: Install required repositories
   ansible.builtin.yum_repository:
     name: "{{ item.name }}"
     baseurl: "{{ item.baseurl }}"