[FAB-17240] Small fix to upgrade doc
[FAB-17240] Small fix to upgrade doc

Word "peer" was omitted in one doc.

Change-Id: Ib132c5f3ea216cf3bf675c0cdee3c727a0bb6893
Signed-off-by: joe-alewine <fe2d55ddcdde6f951d073228e1f2dc081e79a271@ibm.com>

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