[Docs] Fix wording in README instructions for nightly install (#1609)
[Docs] Fix wording in README instructions for nightly install (#1609)


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