integrations: Update HomeAssistant Documentation.

I have updated the docs for the homeassistant integration to include
numbers to increase visibility.

Fixies part of #17633.

zerver/webhooks/homeassistant/doc.md

@@ -1,22 +1,22 @@
-{!create-stream.md!}
+1.  {!create-stream.md!}
 
-Next, on your {{ settings_html|safe }}, create a bot and
+1.  Next, on your {{ settings_html|safe }}, create a bot and
     note its email and API key.
 
-In Home Assistant, you need to add the `notify` service to your
+1.  In Home Assistant, you need to add the `notify` service to your
     `configuration.yaml` file.  This should look something like this:
 
     ![](/static/images/integrations/homeassistant/001.png)
 
-The `api_key` parameter should correspond to your bot's key. The `stream`
+1.  The `api_key` parameter should correspond to your bot's key. The `stream`
     parameter is not necessarily required; if not given, it will default to
     the `homeassistant` stream.
 
-And the URL under `resource` should start with:
+1.  And the URL under `resource` should start with:
 
     `{{ api_url }}/v1/external/homeassistant`
 
-Finally, you need to configure a trigger for the service by adding
+1.  Finally, you need to configure a trigger for the service by adding
     an automation entry in the HomeAssistant `configuration.yaml` file.
 
     ![](/static/images/integrations/homeassistant/002.png)