[FAB-7750] Documentation first-network
[FAB-7750] Documentation first-network

This change-set updates the first-network documentation
to sync with the changes done to include
identity classification as FAB-5664.
See https://gerrit.hyperledger.org/r/#/c/17943/ for
an updated first-network sample using FAB-5664.

Change-Id: Id814a98688113048675aa893681182168d0ea7e7
Signed-off-by: Angelo De Caro <aa3159afc1d353ecf7d91cbd242724ce1f99d443@zurich.ibm.com>

muralisrini/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,binhn/fabric,jimthematrix/fabric,muralisrini/fabric,stemlending/fabric,manish-sethi/fabric-sidedb,jimthematrix/fabric,binhn/fabric,stemlending/fabric,muralisrini/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,binhn/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric,xixuejia/fabric,xixuejia/fabric,stemlending/fabric,manish-sethi/fabric,xixuejia/fabric,manish-sethi/fabric-sidedb,stemlending/fabric,hyperledger/fabric,hyperledger/fabric