Web address might need correction

[SamHobbsOrg]

Describe the bug
The article does not say if the sample code at the beginning is supposed to work but it does not. I found SWI-Prolog -- library(http/websocket): WebSocket support and the address ws://echo.websocket.org does seem to work.

To Reproduce
Steps to reproduce the behavior:

1. Go to WebSockets support in .NET - .NET | Microsoft Learn
2. Put the first sample of code into a program
3. Execute it
4. The program hangs on the call to ReceiveAsync

Expected behavior
ReceiveAsync should not hang.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[welcome]

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[gewarren]

This issue was moved to dotnet/docs#39300