Requested corrections; update to the DID Doc template to only define the keys once and use references thereafter; additional clarifying notes about the DIDDoc
Requested corrections; update to the DID Doc template to only define the keys once and use references thereafter; additional clarifying notes about the DIDDoc

Signed-off-by: Stephen Curran <941e58e189f3c1f0cc08828d7f189c0a4fce1702@gmail.com>

sovrin-foundation/sovrin,sovrin-foundation/sovrin,sovrin-foundation/sovrin