Improve interactive SSR remark for Not Found responses

### Description

We don't hammer home the point enough that the interactive SSR must be globally set. If only the component sets it, the Not Found response no-ops.

### Page URL

https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/navigation?view=aspnetcore-10.0#not-found-responses

### Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/blazor/fundamentals/navigation.md

### Document ID

7856a24d-4cb7-7596-eb95-11d4473c227b

### Platform Id

ffe56891-b8da-11c5-304c-10c9f19e66b9

### Article author

@guardrex

### Metadata

* ID: 7856a24d-4cb7-7596-eb95-11d4473c227b
* PlatformId: ffe56891-b8da-11c5-304c-10c9f19e66b9
* Service: **aspnet-core**
* Sub-service: **blazor**

[Related Issues](https://github.com/dotnet/AspNetCore.Docs/issues?q=is%3Aissue+is%3Aopen+7856a24d-4cb7-7596-eb95-11d4473c227b)