The docs currently have many references to the ports
for the peers (the ports *inside* the Docker network).
I changed these ports recently, so here are the doc
updates to reflect these port changes.

BYFN has the following port mappings:
peer0.org1.example.com - 7051
peer1.org1.example.com - 8051
peer0.org2.example.com - 9051
peer1.org2.example.com - 10051
peer0.org3.example.com - 11051
peer1.org3.example.com - 12051

Change-Id: I46abf0648a4bba481ca054fd6cdf4be557adbaae
Signed-off-by: Simon Stone <sstone1@uk.ibm.com>