Replace "EchoIP" with "echoip"

cf. https://github.com/mpolden/echoip

Signed-off-by: Suguru Hirahara <did🔑z6MkvVZk1A3KBApWJXv2Ju4H14ErDfRGxh8zxdXSZ4vACDg5>

docs/configuring-playbook-turn.md

@@ -26,7 +26,7 @@ If you'd rather use a local IP for `ansible_host`, add the following configurati
 matrix_coturn_turn_external_ip_address: "YOUR_PUBLIC_IP"
 ```
 
-If you'd like to rely on external IP address auto-detection (not recommended unless you need it), set an empty value to the variable. The playbook will automatically contact an [EchoIP](https://github.com/mpolden/echoip)-compatible service (`https://ifconfig.co/json` by default) to determine your server's IP address. This API endpoint is configurable via the `matrix_coturn_turn_external_ip_address_auto_detection_echoip_service_url` variable.
+If you'd like to rely on external IP address auto-detection (not recommended unless you need it), set an empty value to the variable. The playbook will automatically contact an [echoip](https://github.com/mpolden/echoip)-compatible service (`https://ifconfig.co/json` by default) to determine your server's IP address. This API endpoint is configurable via the `matrix_coturn_turn_external_ip_address_auto_detection_echoip_service_url` variable.
 
 If your server has multiple external IP addresses, the coturn role offers a different variable for specifying them:
 

group_vars/matrix_servers

@@ -3105,7 +3105,7 @@ matrix_coturn_container_image_self_build: "{{ matrix_architecture not in ['amd64
 
 # We make the assumption that `ansible_host` points to an external IP address, which may not always be the case.
 # Users are free to set `matrix_coturn_turn_external_ip_address` to an empty string
-# to allow auto-detection (via an EchoIP service) to happen at runtime.
+# to allow auto-detection (via an echoip service) to happen at runtime.
 matrix_coturn_turn_external_ip_address: "{{ ansible_host }}"
 
 matrix_coturn_turn_static_auth_secret: "{{ ((matrix_homeserver_generic_secret_key + ':coturn.sas') | hash('sha512') | to_uuid) if matrix_coturn_authentication_method == 'auth-secret' else '' }}"