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Update compose-var-sub.md (#16400) 

Signed-off-by: accetto 34798830+accetto@users.noreply.github.com

Signed-off-by: accetto 34798830+accetto@users.noreply.github.com
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@ -1,5 +1,5 @@
Your configuration options can contain environment variables. Compose uses the Your configuration options can contain environment variables. Compose uses the
variable values from the shell environment in which `docker-compose` is run. For variable values from the shell environment in which `docker compose` is run. For
example, suppose the shell contains `POSTGRES_VERSION=9.3` and you supply this example, suppose the shell contains `POSTGRES_VERSION=9.3` and you supply this
configuration: configuration:
@ -8,7 +8,7 @@ db:
image: "postgres:${POSTGRES_VERSION}" image: "postgres:${POSTGRES_VERSION}"
``` ```
When you run `docker-compose up` with this configuration, Compose looks for the When you run `docker compose up` with this configuration, Compose looks for the
`POSTGRES_VERSION` environment variable in the shell and substitutes its value `POSTGRES_VERSION` environment variable in the shell and substitutes its value
in. For this example, Compose resolves the `image` to `postgres:9.3` before in. For this example, Compose resolves the `image` to `postgres:9.3` before
running the configuration. running the configuration.
@ -24,7 +24,7 @@ Values set in the shell environment override those set in the `.env` file.
> Note when using docker stack deploy > Note when using docker stack deploy
> >
> The `.env file` feature only works when you use the `docker-compose up` command > The `.env file` feature only works when you use the `docker compose up` command
> and does not work with `docker stack deploy`. > and does not work with `docker stack deploy`.
{: .important } {: .important }