Document URL: 
https://docs.openshift.com/container-platform/3.7/install_config/install/host_preparation.html#installing-docker
https://access.redhat.com/documentation/en-us/openshift_container_platform/3.7/html-single/installation_and_configuration/#installing-docker

Section Number and Name: 


Describe the issue: 
The Host Preparation page for 3.7 seems to have content intended for 3.9 leading to instruction to install incompatible version of docker among other issues. 


Suggestions for improvement: 
Revert/fix/verify the following changes:
https://github.com/openshift/openshift-docs/commit/b1be6fd5deb3ae4d2254fa7c72d587d595bdb24f#diff-64d702b7a9085eb7d6af6e17d7a96469


Additional information: 
This will lead to users installing incorrect version of docker and breaking the installation.