Update index.md (#4771)

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Wang Jie 2017-10-03 01:50:09 +08:00 committed by Jim Galasyn
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@ -8,7 +8,7 @@ This image has commands to install and manage
Docker Universal Control Plane (UCP) on a Docker Engine.
You can configure the commands using flags or environment variables. When using
environment variables use the `docker container run -e VARIABLE_NAME` syntax to pass the
environment variables, use the `docker container run -e VARIABLE_NAME` syntax to pass the
value from your shell, or `docker container run -e VARIABLE_NAME=value` to specify the
value explicitly on the command line.