Documentation: Error trying an example from the docs for 'Example with S3'

[DevopsMercenary]

Describe the bug

I'm trying to setup and run a simple example from the docs. The example is here

terragrunt/docs/_docs/04_reference/config-blocks-and-attributes.md

Line 427 in 9f5b3f5

# Configure terraform state to be stored in S3, in the bucket "my-terraform-state" in us-east-1 under a key that is

and I get a couple of errors.

Steps To Reproduce

I've setup the same folder structure. I have my 'root' /terragrunt.hcl file and I've pasted the example verbatim into the file. Here though I remove the Comments...

remote_state {
  backend = "s3"
  config = {
    bucket = "my-terraform-state"
    key = "${path_relative_to_include()}/terraform.tfstate"
    region = "us-east-1"
    encrypt = true
    dynamodb_table = "my-lock-table"
  }
}

I assume that the file /child/terragrunt.hcl should contain the standard boilerplate....

include "root" {
  path   = find_in_parent_folders()
}

Expected behavior

Running terragrunt plan in the /child folder, I would have expected

But I get the following Error...

$ tg plan
ERRO[0000] Found remote_state settings in /Users/greg/workspace/terragrunt/child/terragrunt.hcl but no backend block in the Terraform code in /Users/greg/workspace/terragrunt/child. You must define a backend block (it can be empty!) in your Terraform code or your remote state settings will have no effect! It should look something like this:

terraform {
  backend "s3" {}
}

ERRO[0000] Unable to determine underlying exit code, so Terragrunt will exit with error code 1

It would be nice if the example was complete and noted there needs to be another file.

# This file is not in the sample code, but it is required
 
terraform {
  backend "s3" {}
}