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Update part2.md (#10457) 

Updated the dockerfile comments consistent with ending period marks.
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hhchou 2020-03-31 10:47:51 -04:00 committed by GitHub
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get-started/part2.md
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@ -92,16 +92,16 @@ The `node-bulletin-board` project is a simple bulletin board application, writte
Take a look at the file called `Dockerfile` in the bulletin board application. Dockerfiles describe how to assemble a private filesystem for a container, and can also contain some metadata describing how to run a container based on this image. The bulletin board app Dockerfile looks like this:
```dockerfile
# Use the official image as a parent image
# Use the official image as a parent image.
FROM node:current-slim
# Set the working directory
# Set the working directory.
WORKDIR /usr/src/app
# Copy the file from your host to your current location
# Copy the file from your host to your current location.
COPY package.json .
# Run the command inside your image filesystem
# Run the command inside your image filesystem.
RUN npm install
# Inform Docker that the container is listening on the specified port at runtime.