doc Auth template changes (#20833)

* doc Auth template changes

* doc Auth template changes

* doc Auth template changes

* doc Auth template changes

* doc Auth template changes

aspnetcore/migration/31-to-50.md

@@ -694,6 +694,39 @@ Apps that rely on the presence of the `ComplexTypeModelBinderProvider` in the `M
 + var complexModelBinderProvider = options.ModelBinderProviders.OfType<ComplexObjectModelBinderProvider>();
 ```
 
+## UseDatabaseErrorPage obsolete
+
+The ASP.NET Core 3.1 templates that include an option for individual user accounts generate a call to <xref:Microsoft.AspNetCore.Builder.DatabaseErrorPageExtensions.UseDatabaseErrorPage%2A>. `UseDatabaseErrorPage` is now obsolete and should be replaced with a combination of `AddDatabaseDeveloperPageExceptionFilter` and `UseMigrationsEndPoint`, as shown in the following code:
+
+```diff
+public void ConfigureServices(IServiceCollection services)
+{
+    services.AddDbContext<ApplicationDbContext>(options =>
+        options.UseSqlServer(
+            Configuration.GetConnectionString("DefaultConnection")));
++   services.AddDatabaseDeveloperPageExceptionFilter();
+    services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
+        .AddEntityFrameworkStores<ApplicationDbContext>();
+    services.AddRazorPages();
+}
+
+public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+{
+    if (env.IsDevelopment())
+    {
+        app.UseDeveloperExceptionPage();
++       app.UseMigrationsEndPoint()
+-       app.UseDatabaseErrorPage();
+    }
+    else
+    {
+        app.UseExceptionHandler("/Error");
+        app.UseHsts();
+    }
+```
+
+For more information, see [this GitHub issue](https://github.com/dotnet/aspnetcore/issues/24987).
+
 ## Review breaking changes
 
 For breaking changes from .NET Core 3.1 to .NET 5.0, see [Breaking changes for migration from version 3.1 to 5.0](/dotnet/core/compatibility/3.1-5.0). ASP.NET Core and Entity Framework Core are also included in the list.