Fix line highlights for "Configure Session State" (#18043)

Author: serpent5

aspnetcore/fundamentals/app-state.md

@@ -89,7 +89,7 @@ To enable the session middleware, `Startup` must contain:
 
 The following code shows how to set up the in-memory session provider with a default in-memory implementation of `IDistributedCache`:
 
-[!code-csharp[](app-state/samples/3.x/SessionSample/Startup4.cs?name=snippet1&highlight=12-19,39)]
+[!code-csharp[](app-state/samples/3.x/SessionSample/Startup4.cs?name=snippet1&highlight=12-19,45)]
 
 The preceding code sets a short timeout to simplify testing.
 

aspnetcore/fundamentals/app-state/samples/3.x/SessionSample/Startup4.cs

@@ -44,11 +44,10 @@ public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
                 app.UseExceptionHandler("/Home/Error");
                 app.UseHsts();
             }
+
             app.UseHttpsRedirection();
             app.UseStaticFiles();
 
-            app.UseHttpContextItemsMiddleware();
-
             app.UseRouting();
 
             app.UseAuthentication();