Add docs section on product creation webhook (#312)

Signed-off-by: Philipp Daun <[email protected]>

Author: daun

docs/content/en/CMS/webhooks.md

@@ -51,11 +51,12 @@ Your URL should point to the following endpoint:
 https://YOURSITE/!/shopify/webhook/collection/delete
 ```
 
-
 ## Product Update
 
 Similarly, rather than running the full import to catch any changes to products, you can add a webhook on **Product Update** that sends any updated data to Statamic and queues a refresh of that product.
 
+Note that Shopify will send the update hook on product creation as well, so no separate webhook is required for that.
+
 Your URL should point to the following endpoint:
 
 ```bash
@@ -102,4 +103,3 @@ StatamicRadPack\Shopify\Events\OrderCreate
 ```
 
 Each event has one property `$data` with the payload data decoded to a `stdClass`.
-