Fix configuration and example in template alarm_control_panel (#11931)

The configuration for template_alarm_control_panel currently doesn't work.  It is similar to the template sensor, and the proposed configuration works.

source/_integrations/alarm_control_panel.template.markdown

@@ -31,7 +31,8 @@ To enable a Template Alarm Control Panel in your installation, add the following
 # Example configuration.yaml entry
 alarm_control_panel:
   - platform: template
-    name: Safe Alarm Panel
+    panels:
+      safe_alarm_panel:
         value_template: "{{ states('alarm_control_panel.real_alarm') }}"
         arm_away:
           service: alarm_control_panel.alarm_arm_away
@@ -56,6 +57,16 @@ alarm_control_panel:
 {% endraw %}
 
 {% configuration %}
+panels:
+  description: List of your panels.
+  required: true
+  type: map
+  keys:
+    alarm_control_panel_name:
+      description: The slug of the panel.
+      required: true
+      type: map
+      keys:
         name:
           description: Name to use in the frontend.
           required: false
@@ -83,6 +94,9 @@ alarm_control_panel:
           type: action
 {% endconfiguration %}
 
+
+
+
 ## Considerations
 
 If you are using the state of a integration that takes extra time to load, the Template Alarm Control Panel may get an `unknown` state during startup. This results in error messages in your log file until that integration has completed loading. If you use `is_state()` function in your template, you can avoid this situation.