This fix updates the Plugin API docs to cover the case of remote
plugins which could be deployed on a host different from the
docker host, through spec or json files.
This fix closes#20188.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: c3ef69270ad397f9e43fc78c15b87ea19b011024
Component: engine