Update packaged release notes for 2.0.12 release (#4094)
Update packaged release notes for 2.0.12 release (#4094)


yugangw-msft/azure-cli,samedder/azure-cli,yugangw-msft/azure-cli,samedder/azure-cli,yugangw-msft/azure-cli,samedder/azure-cli,yugangw-msft/azure-cli,QingChenmsft/azure-cli,QingChenmsft/azure-cli,QingChenmsft/azure-cli,yugangw-msft/azure-cli,QingChenmsft/azure-cli,yugangw-msft/azure-cli,samedder/azure-cli