- Add link to valid image name and tag formats in referenced files - Per review comments, updated docs to remove reference to `USERNAME` and `REGISTRYHOST`. - Per review comment, removed links from man page. - Per review comment, added and updated examples on `docker tag` Signed-off-by: Subhajit Ghosh <isubuz.g@gmail.com> Upstream-commit: ea98cf74aad3c2633268d5a0b8a2f80b331ddc0b Component: engine