Add documentation about 'trigger' support for MQTT Alarm Control Panel (#20492)

source/_docs/mqtt/discovery.markdown

@@ -112,6 +112,7 @@ Supported abbreviations:
     'cmd_tpl':             'command_template',
     'cod_arm_req':         'code_arm_required',
     'cod_dis_req':         'code_disarm_required',
+    'cod_trig_req':        'code_trigger_required',
     'curr_temp_t':         'current_temperature_topic',
     'curr_temp_tpl':       'current_temperature_template',
     'dev':                 'device',
@@ -207,6 +208,7 @@ Supported abbreviations:
     'pl_rst_pr_mode':      'payload_reset_preset_mode',
     'pl_toff':             'payload_turn_off',
     'pl_ton':              'payload_turn_on',
+    'pl_trig':             'payload_trigger',
     'pl_unlk':             'payload_unlock',
     'pos_clsd':            'position_closed',
     'pos_open':            'position_open',

source/_integrations/alarm_control_panel.mqtt.markdown

@@ -80,6 +80,11 @@ code_disarm_required:
   required: false
   type: boolean
   default: true
+code_trigger_required:
+  description: If true the code is required to trigger the alarm. If false the code is not validated.
+  required: false
+  type: boolean
+  default: true
 command_template:
   description: "The [template](/docs/configuration/templating/#processing-incoming-data) used for the command payload. Available variables: `action` and `code`."
   required: false
@@ -201,6 +206,11 @@ payload_not_available:
   required: false
   type: string
   default: offline
+payload_trigger:
+  description: The payload to trigger the alarm on your Alarm Panel.
+  required: false
+  type: string
+  default: TRIGGER
 qos:
   description: The maximum QoS level of the state topic.
   required: false