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remove redundant "Checking Docker Version" section

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The content from line 75 " "Checking Docker Version" section" re-appeared almost exactly identical on line 235 as "Checking Docker Version" . I've removed the lower block but the upper could also be removed, that's up to you.
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Knut Behrends 2019-08-18 14:32:48 +02:00 • committed by GitHub
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@ -232,29 +232,6 @@ Images are just [templates for docker containers](https://docs.docker.com/engine
* [`docker history`](https://docs.docker.com/engine/reference/commandline/history) shows history of image.
* [`docker tag`](https://docs.docker.com/engine/reference/commandline/tag) tags an image to a name (local or registry).
## Checking Docker Version
It is very important that you always know the current version of Docker you are currently running on at any point in time.This is very helpful because you get to know what features are compatible with what you have running. This is also important because you know what containers to run from the docker store when you are trying to get template containers. That said let see how to know what version of docker we have running currently
* ['docker version'](https://docs.docker.com/engine/reference/commandline/version/) check what version of docker you have running
```bash
# Get the server version
docker version --format '{{.Server.Version}}'
```
In Docker 1.8.0 and higher, you can also dump the raw JSON data:
```bash
docker version --format '{{json .}}'
```
will provide the output in JSON format:
```json
{"Client":{"Version":"1.8.0","ApiVersion":"1.20","GitCommit":"f5bae0a","GoVersion":"go1.4.2","Os":"linux","Arch":"am"}
```
### Cleaning up
While you can use the `docker rmi` command to remove specific images, there's a tool called [docker-gc](https://github.com/spotify/docker-gc) that will safely clean up images that are no longer used by any containers. As of docker 1.13, `docker image prune` is also available for removing unused images. See [Prune](#prune).