[FAB-11102] Visual Vocab
[FAB-11102] Visual Vocab

Added images from our visual vocabulary
library to the Glossary & updated
definition for Block. 

Change-Id: I89f7694cd04c3828e3c48fdd2bb47b2178abcc85
Signed-off-by: pama-ibm <9b2a4f3779f0d8bc1012e1b1b041a4315ea7477e@ibm.com>

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