Fix an example in the doc of list regions module

[zliang-akamai]

📝 Description

This is to fix an example in the documentation of the list regions module.

✔️ How to Test

Run ansible-playbook /path/to/main.yaml -vvv against the YAML file with the following content.

---
- name: Create a Linode instance
  hosts: localhost
  gather_facts: no
  tasks:
    - name: Resolve all Linode regions
      linode.cloud.region_list:
        filters:
          - name: site_type
            values: core

[ykim-akamai]

LGTM