Simplify preview notice

Author: danroth27

includes/blazor-preview-notice.md

@@ -1,6 +1,2 @@
 > [!NOTE]
-> **Blazor is an unsupported experimental web framework. Blazor is in preview.**
->
-> Blazor preview documentation is provided to assist you in trying out Blazor. Blazor isn't a committed Microsoft product at this time. Blazor's feature set, capabilities, and tooling are subject to change. Blazor shouldn't be used for production workloads.
->
-> To report bugs and make suggestions for Blazor, open an issue in the [aspnet/Blazor repo](https://github.com/aspnet/Blazor/issues/new).
+> Blazor is an unsupported experimental web framework that should not be used for production workloads at this time.