message: docs: update path front-proxy sandbox
diff: @@ -57,7 +57,7 @@ If you have not cloned the envoy repo, clone it with ``git clone git@github.com:
  or ``git clone https://github.com/lyft/envoy.git``::
  $ pwd
  - envoy/example
  + envoy/examples/front-proxy
  $ docker-compose up --build -d
  $ docker-compose ps
  Name Command State Ports
  