Added reference to Docker volumes documentation.
Added reference to Docker volumes documentation.

Signed-off-by: Maksim Chizhov <879ef0127c17b74e3cfde330137907e639e8ee28@gmail.com>

yazgoo/chef-provisioning-docker,zakeeruddin21/chef-provisioning-docker,chef/chef-provisioning-docker,zakeeruddin21/chef-provisioning-docker,yazgoo/chef-provisioning-docker,marc-/chef-provisioning-docker,marc-/chef-provisioning-docker,chef/chef-provisioning-docker