add docs for distributed K/V discovery with secured TLS communication
add docs for distributed K/V discovery with secured TLS communication

Signed-off-by: Alexandre Beslic <abronan@docker.com>

Closes #1510 and carries
Adding abronan's commentary
Tweak recommend

Signed-off-by: Mary Anthony <5665331b9b819ac358165f8c38970dc8c7ddb47d@docker.com>

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