Removed doc link.

Author: davidbritch

WebServices/AzureSignalR/README.md

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 This sample is a real-time chat application demonstrating the integration of Azure SignalR Service with Azure Functions and Xamarin.Forms.
 
-For more information about this sample see [Azure SignalR Service with Azure Functions and Xamarin.Forms](https://docs.microsoft.com/xamarin/xamarin-forms/data-cloud/serverless/azure-signalr).
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 ## Setting up Azure SignalR Service and Azure Functions
 
 In order to run this sample application an Azure SignalR Service instance and an Azure Functions App must be created. These, high level steps must be performed: