yamldocs: add description to base command
yamldocs: add description to base command

Currently the documentation uses a special case for this command,
so adding a description to the YAML in order to remove that
special case.

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

docker/cli,cpuguy83/cli,thaJeztah/cli,cpuguy83/cli,thaJeztah/cli,docker/cli