Note that webhooks do not support IPv6 (#34271)

Co-authored-by: Ben Ahmady <32935794+subatoi@users.noreply.github.com>

content/developers/webhooks-and-events/webhooks/about-webhooks.md

@@ -12,6 +12,9 @@ versions:
 topics:
   - Webhooks
 ---
+
+{% data reusables.webhooks.webhooks-ipv6 %}
+
 Webhooks allow you to build or set up integrations, such as [{% data variables.product.prodname_github_apps %}](/apps/building-github-apps/) or [{% data variables.product.prodname_oauth_apps %}](/apps/building-oauth-apps/), which subscribe to certain events on GitHub.com. When one of those events is triggered, we'll send a HTTP POST payload to the webhook's configured URL. Webhooks can be used to update an external issue tracker, trigger CI builds, update a backup mirror, or even deploy to your production server. You're only limited by your imagination.
 
 Webhooks can be installed on{% ifversion ghes or ghae %} [{% data variables.product.prodname_enterprise %}](/rest/reference/enterprise-admin#global-webhooks/),{% endif %} an [organization][org-hooks], a specific [repository][repo-hooks], or a {% data variables.product.prodname_github_app %}. Once installed, the webhook will be sent each time one or more subscribed events occurs.

content/developers/webhooks-and-events/webhooks/creating-webhooks.md

@@ -55,6 +55,8 @@ Webhooks require a few configuration options before you can make use of them. We
 
 ## Payload URL
 
+{% data reusables.webhooks.webhooks-ipv6 %}
+
 {% data reusables.webhooks.payload_url %}
 
 Since we're developing locally for our tutorial, we'll set it to the `*.ngrok.io` URL, followed by `/payload`. For example, `http://7e9ea9dc.ngrok.io/payload`.