az acr create: Specifying the wrong case for --sku gives a confusing error message

[johanste]

Describe the bug
$> az acr create -g connectorregistry -n xxsamplejohanstexx --sku basic
az acr create: 'basic' is not an az acr create command. See 'az acr create --help'.

The most similar command to 'basic' is:
Basic

To Reproduce
See description

Expected behavior
An error message telling me the set of valid values for the --sku parameter. Additionally, the --sku parameter should be case insensitive, and thus the command should actually have succeeded

Environment summary
2.0.32, ran in cmd.exe

Additional context