Update libcontainer to db65c35051d05f3fb218a0e84a1

Signed-off-by: Michael Crosby <michael@docker.com>
Merge pull request #7648 from crosbymichael/update-libcontainer-aug5

Update libcontainer to db65c35051d05f3fb218a0e84a1
Clean up typos in hub_registry_spec.md

Couple of instances of incorrect articles (e.g. "an Docker Hub").