Update 1.9.0 Release notes after STJ recent changes (OrchardCMS#15587)

src/docs/releases/1.9.0.md

@@ -8,24 +8,6 @@ Release date: Not yet released
 
 The utilization of [Newtonsoft.Json](https://www.nuget.org/packages/Newtonsoft.Json) has been discontinued in both **YesSql** and **OrchardCore**. Instead, we have transitioned to utilize `System.Text.Json` due to its enhanced performance capabilities. To ensure compatibility with `System.Text.Json` during the serialization or deserialization of objects, the following steps need to be undertaken:
 
- - If your custom `Document` includes a collection with a getter-only property, it is imperative to incorporate a setter or utilize the `init` modifier to facilitate the assignment of values by `System.Text.Json`. For instance:
-
-```csharp
-public class MediaProfilesDocument : Document
-{
-    public Dictionary<string, MediaProfile> MediaProfiles { get; } = new(StringComparer.OrdinalIgnoreCase);
-}
-```
-
-Should be changed to the following instead:
-
-```csharp
-public class MediaProfilesDocument : Document
-{
-    public Dictionary<string, MediaProfile> MediaProfiles { get; init; } = new(StringComparer.OrdinalIgnoreCase);
-}
-```
-
   - If you are using a custom deployment steps, change how you register it by using the new `AddDeployment<>` extension. This extension adds a new service that is required for proper serialization. For instance, instead of registering your deployment step like this:
 
 ```csharp