Documentation: Multiple Includes example syntax I think is incorrect.

[DevopsMercenary]

Describe the bug

I was trying to replicate the example that is documented here...

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

Line 546 in 9f5b3f5

_Multiple includes_

Steps To Reproduce

There is a reference to a /region.hcl file but there is no details as to what the contents are. I tried a standard tfvars type format...

region = "production"

but I got this error...

]$ tg init
ERRO[0000] Error: Unsupported argument

ERRO[0000]   on /Users/greg/workspace/terragrunt/multiple-includes-example/region.hcl line 1:
ERRO[0000]    1: region = "production"
ERRO[0000]
ERRO[0000] An argument named "region" is not expected here.

ERRO[0000] /Users/greg/workspace/terragrunt/multiple-includes-example/region.hcl:1,1-7: Unsupported argument; An argument named "region" is not expected here.
ERRO[0000] Unable to determine underlying exit code, so Terragrunt will exit with error code 1

Shouldn't the syntax use a 'include.locals" or a "include.inputs". ?