[docs] encryption-at-rest is now natively supported

This is a follow-up to c5956652522311e2bf5263aa05129d4b79c22d52.

Change-Id: Ia0ebd410dae1e17641826795b2ac0b0ba7648d00
Reviewed-on: http://gerrit.cloudera.org:8080/21336
Reviewed-by: Mahesh Reddy <mreddy@cloudera.com>
Tested-by: Alexey Serbin <alexey@apache.org>
Reviewed-by: Attila Bukor <abukor@apache.org>
2 files changed