Command error in section "Sharing Environments"

[jianingwang123]

Describe the issue:
When use the command az account show provided by section "Sharing Environments" of README.md, it cannot be got the AZURE_PRINCIPAL_ID.
Error is as follows:

Expected behavior:
Run command to get the AZURE_PRINCIPAL_ID .

Suggestion:
Change az account show to az ad signed-in-user show --query id.

@charris-msft to notification.