This feature was added in docker 1.8, through
7491f9a9c1.
However, the API docs ended up in the wrong
API version (1.19 instead of 1.20), so were
never included in future API docs.
Also, the CLI docs got lost during splitting
up the cli.md docs into separate files;
561bfb268d
This moves the API docs to the correct
versions, and restores the CLI documentation.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>