message: docs: point ref_configs templates to v2 (yaml)
  The format (and filenames) changed in
diff: @@ -24,9 +24,9 @@ we use at Lyft. We have also included three example configuration templates for
  three scenarios.
  * Generator script: :repo:`configs/configgen.py`
  -* Service to service template: :repo:`configs/envoy_service_to_service.template.json`
  -* Front proxy template: :repo:`configs/envoy_front_proxy.template.json`
  -* Double proxy template: :repo:`configs/envoy_double_proxy.template.json`
  +* Service to service template: :repo:`configs/envoy_service_to_service_v2.template.yaml'`
  +* Front proxy template: :repo:`configs/envoy_front_proxy_v2.template.yaml`
  +* Double proxy template: :repo:`configs/envoy_double_proxy_v2.template.yaml`
  To generate the example configurations run the following from the root of the repo:
  