Revert section added on #21057 when dotnet/runtime#45560 is resolved.

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• ID: 08de9daf-79aa-ee76-431e-f2432f8d691e
• Version Independent ID: 1a1ee728-1741-c82a-75e1-06159709935b
• Content: Use ASP.NET Core SignalR with a hosted Blazor WebAssembly app
• Content Source: aspnetcore/tutorials/signalr-blazor-webassembly.md
• Product: aspnet-core
• Technology: aspnetcore-tutorials
• GitHub Login: @guardrex
• Microsoft Alias: riande