Added doc note on testing artifacts.
Added doc note on testing artifacts.

devigned/azure-powershell,AzureAutomationTeam/azure-powershell,ClogenyTechnologies/azure-powershell,AzureAutomationTeam/azure-powershell,devigned/azure-powershell,ClogenyTechnologies/azure-powershell,devigned/azure-powershell,ClogenyTechnologies/azure-powershell,AzureAutomationTeam/azure-powershell,AzureAutomationTeam/azure-powershell,devigned/azure-powershell,ClogenyTechnologies/azure-powershell,devigned/azure-powershell,AzureAutomationTeam/azure-powershell,ClogenyTechnologies/azure-powershell,AzureAutomationTeam/azure-powershell,devigned/azure-powershell