docs/google: fix code blocks

Docker-DCO-1.1-Signed-off-by: Johan Euphrosine <proppy@google.com> (github: proppy)
Merge pull request #6241 from proppy/fix-google-docs

docs/google: fix code blocks
improve trusted location detection

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #6255 from vieux/improve_trusted_detection

improve trusted location detection
Add CAP_KILL to unprivileged containers
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Merge pull request #6258 from crosbymichael/capkill

Add CAP_KILL to unprivileged containers
improve commit performance for btrfs

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)