update to use --name, and add a little more detail to how docker start -a works

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Merge pull request #4444 from SvenDowideit/update-host-integration-docs

update to use --name, and add a little more detail to how docker start -a works