update code example to use the noted {:system, "PORT"} syntax and add distillery to mix command to solve "(Mix) The task "release" could not be found"
Checklist
simple doc change
Licensing/Copyright
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Summary of changes
update code example to use the noted {:system, "PORT"} syntax and add distillery to mix command to solve "(Mix) The task "release" could not be found"
Checklist
Licensing/Copyright
By submitting this PR, you agree to the following statement, please read before submission!
I certify that I own, and have sufficient rights to contribute, all source code and related material intended to be compiled or integrated with the source code for Distillery (the "Contribution"). My Contribution is licensed under the MIT License.
NOTE: If you submit a PR and remove the statement above, your PR will be rejected. For your PR to be considered, it must contain your agreement to license under the MIT license.