docs: fix post-processor(checksum) hcl example. (#10734)
docs: fix post-processor(checksum) hcl example. (#10734)


pecigonzalo/packer,mitchellh/packer,ricardclau/packer,mitchellh/packer,hashicorp/packer,rnaveiras/packer,pecigonzalo/packer,hashicorp/packer,ricardclau/packer,hashicorp/packer,mitchellh/packer,rnaveiras/packer,ricardclau/packer,rnaveiras/packer,mitchellh/packer,rnaveiras/packer,rnaveiras/packer,pecigonzalo/packer,ricardclau/packer,rnaveiras/packer,pecigonzalo/packer,hashicorp/packer,mitchellh/packer,ricardclau/packer,ricardclau/packer