Update BWA solution start guidance (#35624)

Author: guardrex

aspnetcore/blazor/security/blazor-web-app-with-entra.md

@@ -43,6 +43,8 @@ The sample solution consists of the following projects:
 
 Access the sample through the latest version folder in the Blazor samples repository with the following link. The sample is in the `BlazorWebAppEntra` folder for .NET 9 or later.
 
+Start the solution from the ***`Aspire/Aspire.AppHost` project***.
+
 [View or download sample code](https://github.com/dotnet/blazor-samples) ([how to download](xref:blazor/fundamentals/index#sample-apps))
 
 ## Microsoft Entra ID app registrations

aspnetcore/blazor/security/blazor-web-app-with-oidc.md

@@ -45,6 +45,8 @@ The sample app consists of the following projects:
 
 Access the sample through the latest version folder in the Blazor samples repository with the following link. The sample is in the `BlazorWebAppOidc` folder for .NET 8 or later.
 
+Start the solution from the ***`Aspire/Aspire.AppHost` project***.
+
 [View or download sample code](https://github.com/dotnet/blazor-samples) ([how to download](xref:blazor/fundamentals/index#sample-apps))
 
 Sample solution features:

aspnetcore/blazor/security/includes/troubleshoot-server.md

@@ -103,9 +103,16 @@ A functioning app may fail immediately after upgrading either the .NET Core SDK
 > [!NOTE]
 > Use of package versions incompatible with the app's target framework isn't supported. For information on a package, use the [NuGet Gallery](https://www.nuget.org).
 
-### Run the server app
+### Start the solution from the correct project
 
-When testing and troubleshooting Blazor Web App, make sure that you're running the app from the server project.
+Blazor Web Apps:
+
+* For one of the Backend-for-Frontend (BFF) pattern samples, start the solution from the ***`Aspire/Aspire.AppHost` project***.
+* For one of the non-BFF pattern samples, start the solution from the ***server project***.
+
+Blazor Server:
+
+Start the solution from the ***server project***.
 
 ### Inspect the user