Instructions on timber.io website fail. Defining module >1 times causes TF to fail

[krisread]

As per the website

https://docs.timber.io/setup/platforms/aws-cloudwatch-logs

Many of our customers like to define individual Timber sources for each lambda function. If you're one of these customers simply define the Terraform module multiple times with the appropriate source_id for each.

This does not work.

From my test:

Error: Duplicate module call
  on timber-io.tf line 14:
  14: module "timber_log_forwarding" {

An module call named "timber_log_forwarding" was already defined at
timber-io.tf:6,1-31. Module calls must have unique names within a module.