If a container is started with a memory limit of 0, no memory limit is applied. To prevent this from causing confusion, make interaction explicit in docs. Docker-DCO-1.1-Signed-off-by: Matthew Heon <mheon@redhat.com> (github: mheon) Upstream-commit: ba1c0f4c817e958693cfcef30f1de9991765d5db Component: engine