Updated documentation url to point to https://learn.microsoft.com/dot…

…net/orleans/streaming

orleans/ChatRoom/README.md

@@ -14,7 +14,7 @@ description: "An Orleans sample chat room app."
 
 ![A screenshot of the chat client](screenshot.png)
 
-This sample uses [Orleans Streaming](http://dotnet.github.io/orleans/docs/streaming/index.html) to build a basic chat application. In this application, each client can:
+This sample uses [Orleans Streaming](https://learn.microsoft.com/dotnet/orleans/streaming) to build a basic chat application. In this application, each client can:
 
 * Set their name
 * Join and leave a channel