Add notes about obsolete interfaces

Author: sofietoft

15/umbraco-cms/reference/templating/modelsbuilder/understand-and-extend.md

@@ -5,7 +5,9 @@ description: "Understand and extend modelsbuilder"
 
 # Understand and Extend
 
-Models are generated as partial classes. In its most basic form, a model for content type `TextPage` ends up in a `TextPage.generated.cs` file and looks like:
+Models are generated as partial classes. In its most basic form, a model for content type `TextPage` ends up in a `TextPage.generated.cs` file and looks like shown below.
+
+{% include "../../../.gitbook/includes/obsolete-warning-ipublishedsnapshotaccessor.md" %}
 
 ```csharp
 /// <summary>TextPage</summary>

15/umbraco-cms/reference/webhooks/README.md

@@ -132,7 +132,9 @@ builder.WebhookEvents().Clear().AddCms(false);
 
 ## Replace Webhook Events
 
-Sometimes it is desirable to modify one of the standard Umbraco webhooks, for example, to change the Payload. This can be done by adding a custom implementation, as shown in the code example below:
+Sometimes it is desirable to modify one of the standard Umbraco webhooks, for example, to change the Payload. This can be done by adding a custom implementation, as shown in the code example below.
+
+{% include "../../.gitbook/includes/obsolete-warning-ipublishedsnapshotaccessor.md" %}
 
 ```csharp
 [WebhookEvent("Content Published", Constants.WebhookEvents.Types.Content)]

15/umbraco-cms/reference/webhooks/expanding-webhook-events.md

@@ -140,6 +140,8 @@ To leverage the `WebhookEventContentBase<TNotification, TEntity>` class, follow
 
    If we take a look at the `ContentPublishedWebhookEvent`, we can see how these methods are overriden.
 
+   {% include "../../../.gitbook/includes/obsolete-warning-ipublishedsnapshotaccessor.md" %}
+
    ```csharp
    protected override IEnumerable<IContent> GetEntitiesFromNotification(ContentPublishedNotification notification) => notification.PublishedEntities;