Surface Blazor 9.0 Preview 2 content (#32033)

aspnetcore/release-notes/aspnetcore-9/includes/blazor.md

@@ -1,7 +1,4 @@
-New Blazor features will appear with the release of Preview 2 in March, 2024.
-
-<!--
-### Constructor injection (Preview 2, mid-March)
+### Constructor injection
 
 Razor components support constructor injection.
 
@@ -16,7 +13,7 @@ public partial class ConstructorInjection(NavigationManager navigation)
 
 For more information, see <xref:blazor/fundamentals/dependency-injection?view=aspnetcore-9.0#request-a-service-in-a-component>.
 
-### Websocket compression for Interactive Server components (Preview 2, mid-March)
+### Websocket compression for Interactive Server components
 
 By default, Interactive Server components enable compression for [WebSocket connections](xref:fundamentals/websockets) and set a `frame-ancestors` [Content Security Policy (CSP)](https://developer.mozilla.org/docs/Web/HTTP/CSP) directive set to `'self'`, which only permits embedding the app in an `<iframe>` of the origin from which the app is served when compression is enabled or when a configuration for the WebSocket context is provided.
 
@@ -36,4 +33,3 @@ For more information, see the following resources:
 
 * <xref:blazor/fundamentals/signalr?view=aspnetcore-9.0#websocket-compression-for-interactive-server-components>
 * <xref:blazor/security/server/interactive-server-side-rendering?view=aspnetcore-9.0#interactive-server-components-with-websocket-compression-enabled>
--->