RootCommand.cs: Added info about missing option --outdir.

[o-l-a-v]

Added info about missing option --outdir.

This works in my testing ( #14186 ), but was not outputted when doing bicep --help.

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  resource aksCluster 'Microsoft.ContainerService/managedClusters@2021-03-01' = {
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[anthony-c-martin]

Thank you for fixing this!

[github-actions]

Test this change out locally with the following install scripts (Action run 9453870621)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 9453870621

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 9453870621"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 9453870621

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 9453870621"