It was suggested to me that documentation for "docker pull" and "docker
push" should reference "docker login", to make clearer how to specify
credentials for a push or pull operation. Add a note to the manual pages
and reference documentation explaining how registry credentials are
managed.
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
Upstream-commit: fb5ea0c0efec238aeeff7c5c3742a0e4eccff2c7
Component: engine
4afee18d2e