Clarify use of IHttpContextAccessor/HttpContext (dotnet#32260)

Author: guardrex

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

@@ -48,6 +48,9 @@ The `BlazorWebAppOidc` project is the server-side project of the Blazor Web App.
 
 The `BlazorWebAppOidc.http` file can be used for testing the weather data request. Note that the `BlazorWebAppOidc` project must be running to test the endpoint, and the endpoint is hardcoded into the file. For more information, see <xref:test/http-files>.
 
+> [!NOTE]
+> The server project uses <xref:Microsoft.AspNetCore.Http.IHttpContextAccessor>/<xref:Microsoft.AspNetCore.Http.HttpContext>, but never for interactively-rendered components. For more information, see <xref:blazor/security/server/interactive-server-side-rendering#ihttpcontextaccessorhttpcontext-in-razor-components>.
+
 ### Configuration
 
 This section explains how to configure the sample app.
@@ -281,6 +284,9 @@ The `BlazorWebAppOidc` project is the server-side project of the Blazor Web App.
 
 The `BlazorWebAppOidc.http` file can be used for testing the weather data request. Note that the `BlazorWebAppOidc` project must be running to test the endpoint, and the endpoint is hardcoded into the file. For more information, see <xref:test/http-files>.
 
+> [!NOTE]
+> The server project uses <xref:Microsoft.AspNetCore.Http.IHttpContextAccessor>/<xref:Microsoft.AspNetCore.Http.HttpContext>, but never for interactively-rendered components. For more information, see <xref:blazor/security/server/interactive-server-side-rendering#ihttpcontextaccessorhttpcontext-in-razor-components>.
+
 ### Configuration
 
 This section explains how to configure the sample app.