[FAB-11043] Remove "-stable" suffix in upgrade docs
[FAB-11043] Remove "-stable" suffix in upgrade docs

In docker hub, there is no "-stable" tag for fabric images.
However, "-stable" tag is written in upgrade docs and
upgrades steps fail. This CR removes "-stable" tag.

FAB-11043 #done

Change-Id: I85c9b7c5b39c09c1ac331cb226fe5dae67e26707
Signed-off-by: Nao Nishijima <ba12c351dbe96870a968dc0b0668a4a809432a94@hal.hitachi.com>

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