Change WS-Trust endpoint warning message

The warning in this section of code introduced in #153

microsoft-authentication-cli/src/MSALWrapper/AuthFlow/IntegratedWindowsAuthentication.cs

Lines 111 to 114 in 85a51c3

    
           if (ex.Message.Contains("WS-Trust endpoint not found")) 
        
           { 
        
               this.logger.LogWarning($"IWA only works on Corp Net, please turn on VPN."); 
        
           }

could probably be more generic and refer to a non-Microsoft solution. How else could we phrase this?

@reillysiemens we could change "Corp Net" to something more generic like "corporate AD backed" networks. Though we should make sure it's accurate.

	if (ex.Message.Contains("WS-Trust endpoint not found"))
	{
	this.logger.LogWarning($"IWA only works on Corp Net, please turn on VPN.");
	}