extraneous 'a'

in *Build the app*, replace:

`if you want to use the a shorter option` with
`if you want to use the shorter option`
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Stuart C. Robinson 2019-01-18 11:26:16 -05:00 committed by GitHub
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@ -156,7 +156,7 @@ Dockerfile app.py requirements.txt
```
Now run the build command. This creates a Docker image, which we're going to
name using the `--tag` option. Use `-t` if you want to use the a shorter option.
name using the `--tag` option. Use `-t` if you want to use the shorter option.
```shell
docker build --tag=friendlyhello .