Fix small typo in step_four.md. (#1053)

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grahammadden 2017-01-09 17:04:32 -05:00 committed by John Mulhausen
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@ -79,7 +79,7 @@ creating an image which runs on Linux.
The `whalesay` image is based on Ubuntu, which uses `apt-get` to install
packages. These two commands refresh the list of packages available to the
image and install the `fortunes` program into it. The `fortunes` program has
image and install the `fortunes` program into it. The `fortunes` program
prints out wise sayings for our whale to say.
6. Add a `CMD` statement, which tells the image the final command to run after