Add documentation about `scaleway_config` data source

[remyleone]

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Terraform Version

Affected Resource(s)

• scaleway_XXXX

Terraform Configuration Files

# Copy-paste the minimal (if possible) terraform configuration to reproduce the bug here - for large Terraform configs,
# please use a service like Dropbox and share a link to the ZIP file. For
# security, you can also encrypt the files using our GPG public key: https://keybase.io/hashicorp

Debug Output

Panic Output

Expected Behavior

Actual Behavior

Steps to Reproduce

1. terraform apply

Important Factoids

References

• #0000