docs/provisioners/index: Add link to Template Provisioners section
docs/provisioners/index: Add link to Template Provisioners section

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