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added clarification to swarm configs and stack deploy topic (#5159) 

Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>
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engine/swarm/configs.md
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@ -61,6 +61,17 @@ In order to update or roll back configs more easily, consider adding a version
number or date to the config name. This is made easier by the ability to control
the mount point of the config within a given container.
To update a stack, make changes to your Compose file, then re-run `docker
stack deploy -c <new-compose-file> <stack-name>`. If you use a new config in
that file, your services will start using them. Keep in mind that configurations
are immutable, so you won't be able to change the file for an existing service.
Instead, you create a new config to use a different file
You can run `docker stack rm` to stop the app and take down the stack. This
removes any config that was created by `docker stack deploy` with the same stack
name. This removes _all_ configs, including those not referenced by services and
those remaining after a `docker service update --config-rm`.
## Read more about `docker config` commands
Use these links to read about specific commands, or continue to the