[FAB-13627] Add LTS to v1.4 What's New doc
[FAB-13627] Add LTS to v1.4 What's New doc

Add long term support policy
to v1.4 What's New doc.

Change-Id: Ic375c9db3a10b79590c252bde5d16a84a96ff15a
Signed-off-by: David Enyeart <3d699cfec69cc11a9ba1c3a1aef3260ab163489b@us.ibm.com>

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