Update number.mqtt.markdown (home-assistant#20791)

JeeCee1 · web-flow · commit 61d904d7e8dd · 2021-12-21T10:26:27.000+01:00
diff --git a/source/_integrations/number.mqtt.markdown b/source/_integrations/number.mqtt.markdown
@@ -56,7 +56,7 @@ command_template:
   type: template
 command_topic:
   description: The MQTT topic to publish commands to change the number.
-  required: false
+  required: true
   type: string
 device:
   description: "Information about the device this Number is a part of to tie it into the [device registry](https://developers.home-assistant.io/docs/en/device_registry_index.html). Only works through [MQTT discovery](/docs/mqtt/discovery/) and when [`unique_id`](#unique_id) is set. At least one of identifiers or connections must be present to identify the device."
