Update configDataCredentials.md (#2474)

Passwords are not kept encrypted at all times when using Azure Automation so I have removed this reference.

Author: waynehoggett

dsc/configDataCredentials.md

@@ -283,10 +283,6 @@ DomainCredentialExample -DomainCredential $cred -ConfigurationData $cd
 
 **Microsoft advises to avoid plain text passwords due to the significant security risk.**
 
-An exception would be when using the Azure Automation DSC service,
-only because the data is always stored encrypted
-(in transit, at rest in the service, and at rest on the node).
-
 ## Domain Credentials
 
 Running the example configuration script again (with or without encryption),
@@ -320,4 +316,4 @@ $cd = @{
 }
 ```
 
-Now the configuration script will generate the MOF file with no errors or warnings.
+Now the configuration script will generate the MOF file with no errors or warnings.