Fix broken code snippets and links (#35655)

Author: guardrex

aspnetcore/security/authentication/ws-federation.md

@@ -74,42 +74,66 @@ By default, the new middleware:
 
 ![Microsoft Entra ID: App registration properties](ws-federation/_static/AadAppIdUri.png)
 
+:::moniker range=">= aspnetcore-2.1"
+
 ## Use WS-Federation without ASP.NET Core Identity
 
 The WS-Federation middleware can be used without Identity. For example:
+
+:::moniker-end
+
 :::moniker range=">= aspnetcore-3.0"
-[!code-csharp[](ws-federation/samples/StartupNon31.cs?name=snippet)]
+
+:::code language="csharp" source="ws-federation/samples/StartupNon31.cs" id="snippet":::
+
 :::moniker-end
 
 :::moniker range=">= aspnetcore-2.1 < aspnetcore-3.0"
-[!code-csharp[](ws-federation/samples/StartupNon21.cs?name=snippet)]
+
+:::code language="csharp" source="ws-federation/samples/StartupNon21.cs" id="snippet":::
+
 :::moniker-end
 
+:::moniker range=">= aspnetcore-2.1"
+
 ## Add WS-Federation as an external login provider for ASP.NET Core Identity
 
 * Add a dependency on [Microsoft.AspNetCore.Authentication.WsFederation](https://www.nuget.org/packages/Microsoft.AspNetCore.Authentication.WsFederation) to the project.
+
 * Add WS-Federation to `Startup.ConfigureServices`:
 
+:::moniker-end
+
 :::moniker range=">= aspnetcore-3.0"
-[!code-csharp[](ws-federation/samples/Startup31.cs?name=snippet)]
+
+:::code language="csharp" source="ws-federation/samples/Startup31.cs" id="snippet":::
+
+[!INCLUDE [default settings configuration](social/includes/default-settings.md)]
+
 :::moniker-end
 
 :::moniker range=">= aspnetcore-2.1 < aspnetcore-3.0"
-[!code-csharp[](ws-federation/samples/Startup21.cs?name=snippet)]
-:::moniker-end
+
+:::code language="csharp" source="ws-federation/samples/Startup21.cs" id="snippet":::
 
 [!INCLUDE [default settings configuration](social/includes/default-settings.md)]
 
+:::moniker-end
+
 ### Log in with WS-Federation
 
 Browse to the app and click the **Log in** link in the nav header. There's an option to log in with WsFederation:
+
 ![Log in page](ws-federation/_static/WsFederationButton.png)
 
 With ADFS as the provider, the button redirects to an ADFS sign-in page:
+
 ![ADFS sign-in page](ws-federation/_static/AdfsLoginPage.png)
 
 With Microsoft Entra ID as the provider, the button redirects to a Microsoft Entra ID sign-in page:
+
 ![Microsoft Entra ID sign-in page](ws-federation/_static/AadSignIn.png)
 
 A successful sign-in for a new user redirects to the app's user registration page:
+
 ![Register page](ws-federation/_static/Register.png)

aspnetcore/security/authentication/ws-federation/samples/Startup21.cs

@@ -25,7 +25,7 @@ public Startup(IConfiguration configuration)
         public IConfiguration Configuration { get; }
 
         // This method gets called by the runtime. Use this method to add services to the container.
-        #region snippet
+        // <snippet>
         public void ConfigureServices(IServiceCollection services)
         {
             services.AddDbContext<ApplicationDbContext>(options =>
@@ -50,7 +50,7 @@ public void ConfigureServices(IServiceCollection services)
 
             services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
         }
-        #endregion
+        // </snippet>
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
         public void Configure(IApplicationBuilder app, IHostingEnvironment env)

aspnetcore/security/authentication/ws-federation/samples/Startup31.cs

@@ -18,7 +18,7 @@ public Startup(IConfiguration configuration)
 
         public IConfiguration Configuration { get; }
 
-        #region snippet
+        // <snippet>
         public void ConfigureServices(IServiceCollection services)
         {
             services.AddDbContext<ApplicationDbContext>(options =>
@@ -45,7 +45,7 @@ public void ConfigureServices(IServiceCollection services)
             services.AddControllersWithViews();
             services.AddRazorPages();
         }
-        #endregion
+        // </snippet>
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
         public void Configure(IApplicationBuilder app, IWebHostEnvironment env)

aspnetcore/security/authentication/ws-federation/samples/StartupNon21.cs

@@ -17,7 +17,7 @@ public Startup(IConfiguration configuration)
 
         public IConfiguration Configuration { get; }
 
-        #region snippet
+        // <snippet>
         public void ConfigureServices(IServiceCollection services)
         {
             services.AddAuthentication(sharedOptions =>
@@ -62,7 +62,7 @@ public void Configure(IApplicationBuilder app, IHostingEnvironment env)
                     template: "{controller=Home}/{action=Index}/{id?}");
             });
         }
-        #endregion
+        // </snippet>
 
     }
 }

aspnetcore/security/authentication/ws-federation/samples/StartupNon31.cs

@@ -17,7 +17,7 @@ public Startup(IConfiguration configuration)
 
         public IConfiguration Configuration { get; }
 
-        #region snippet
+        // <snippet>
         public void ConfigureServices(IServiceCollection services)
         {
             services.AddAuthentication(sharedOptions =>
@@ -64,6 +64,6 @@ public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
                 endpoints.MapRazorPages();
             });
         }
-        #endregion
+        // </snippet>
     }
 }