Update file header (#21054)

* Update file header

* Update __init__.py

homeassistant/components/mailbox/asterisk_cdr.py

@@ -1,9 +1,4 @@
-"""
-Asterisk CDR interface.
-
-For more details about this platform, please refer to the documentation at
-https://home-assistant.io/components/mailbox.asterisk_cdr/
-"""
+"""Support for the Asterisk CDR interface."""
 import logging
 import hashlib
 import datetime
@@ -14,9 +9,11 @@ from homeassistant.components.asterisk_mbox import DOMAIN as ASTERISK_DOMAIN
 from homeassistant.components.mailbox import Mailbox
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 
-DEPENDENCIES = ['asterisk_mbox']
 _LOGGER = logging.getLogger(__name__)
-MAILBOX_NAME = "asterisk_cdr"
+
+DEPENDENCIES = ['asterisk_mbox']
+
+MAILBOX_NAME = 'asterisk_cdr'
 
 
 async def async_get_handler(hass, config, discovery_info=None):