Bump dcos-docs
Bump dcos-docs

Bump dcos/dcos-docs
  Karl Isenberg:
     Clean up recommendations and add CentOS 7.2 upgrade instructions
     storage drivers are a docker config
     Seperated recommendations from instructions
     Clarify CentOS install recommendations
     Use absolute urls (custom install)
     Extract CentOS Docker install instructions
  Suzanne Scala:
     cleaned up recommendation section

brndnmtthws/dcos-website,brndnmtthws/dcos-website,dcos/dcos-website,brndnmtthws/dcos-website,ahoskins/dcos-website,ahoskins/dcos-website,dcos/dcos-website,brndnmtthws/dcos-website,ahoskins/dcos-website,dcos/dcos-website,dcos/dcos-website,ahoskins/dcos-website