Incorrect xhyve vm login instructions in Docker guide

[cachance7]

Elasticsearch version: 6.4.2 (current)

Plugins installed: []

OS version: OSX 10.13.6

Docker For Mac version: 18.06.1-ce-mac73 (26764)

Description of the problem:

The following page now states an incorrect command to run to log into the xhyve virtual machine for setting vm.max_map_count in recent Docker for Mac releases. https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html

Listed command:
screen ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty

Working command:
screen ~/Library/Containers/com.docker.docker/Data/vms/0/tty

[elasticmachine]

Pinging @elastic/es-core-infra

[dliappis]

Thanks for the report @cachance7 !

I raised #35755 to address this.