Fix some minor issues in vfs storage-driver section
Fix some minor issues in vfs storage-driver section

- Fix mention of `storage-drivers` instead of `storage-opts`
- Repeat the selected driver in the second `daemon.json` example
- Remove mention of `CE` as this driver can be used
  on Docker EE (although it's mainly intending for
  debugging, so not a "supported" driver)

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

thaJeztah/docker.github.io,thaJeztah/docker.github.io,londoncalling/docker.github.io,docker/docker.github.io,londoncalling/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,londoncalling/docker.github.io,docker/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,londoncalling/docker.github.io,docker/docker.github.io,londoncalling/docker.github.io,thaJeztah/docker.github.io