message: fix(dev-infra): Correctly place comments in dockerfile
  The doc in says that
  "Docker treats lines that begin with # as a comment, unless the line is a valid parser directive. A # marker anywhere else in a line is treated as an argument."
  Fixes
  PR Close
diff: # Image metadata and config.
  -FROM circleci/node:10-browsers # Ideally, the image version should be what we use on CI.
  +# Ideally, the image version should be what we use on CI.
  # See `executors > browsers-executor` in `.circleci/config.yml`.
  +FROM circleci/node:10-browsers
  +
  LABEL name="Angular dev environment" \
  description="This image can be used to create a dev environment for building Angular." \
  @@ -16,8 +18,10 @@ USER root
  # Configure `Node.js`/`npm` and install utilities.
  RUN npm config --global set user root
  -RUN npm install --global yarn@latest # Ideally, the version should be what we use on CI.
  +
  +# Ideally, the version should be what we use on CI.
  # See `commands > overwrite_yarn` in `.circleci/config.yml`.
  +RUN npm install --global yarn@latest
  # Go! (And keep going.)
  