Merge pull request #4125 from aspnet/master

Update live with current master

aspnet/web-forms/overview/performance-and-caching/using-asynchronous-methods-in-aspnet-45/samples/sample8.cs

@@ -1,4 +1,4 @@
-protected void Page_Load(object sender, EventArgs e) {
+protected async void Page_Load(object sender, EventArgs e) {
     await ...;
     // do work
-}
+}

aspnetcore/getting-started/sample/aspnetcoreapp/Program2x.cs

@@ -1,7 +1,7 @@
 using Microsoft.AspNetCore;
 using Microsoft.AspNetCore.Hosting;
 
-namespace WebApplication5
+namespace aspnetcoreapp
 {
     public class Program
     {
@@ -15,4 +15,4 @@ namespace WebApplication5
                 .UseStartup<Startup>()
                 .Build();
     }
-}
+}

aspnetcore/tutorials/first-web-api-mac.md

@@ -54,7 +54,7 @@ Enter **TodoApi** for the **Project Name**, and then select Create.
 
 ### Launch the app
 
-In Visual Studio, select **Run > Start With Debugging** to launch the app. Visual Studio launches a browser and navigates to `http://localhost:port`, where *port* is a randomly chosen port number. You get an HTTP 404 (Not Found) error.  Change the URL to `http://localhost:port/api/values`. The `ValuesController` data will be displayed:
+In Visual Studio, select **Run > Start With Debugging** to launch the app. Visual Studio launches a browser and navigates to `http://localhost:5000`. You get an HTTP 404 (Not Found) error.  Change the URL to `http://localhost:port/api/values`. The `ValuesController` data will be displayed:
 
 ```
 ["value1","value2"]