Misleading explanation on az keyvault create --enable-purge-protection

Please look at explanation of `--enable-purge-protection` - for me it seems contradictory

> Enabling this functionality is irreversible - that is, the property does not accept **false** as its value.
> accepted values: **false**, true

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#### Document Details

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* ID: 226e5769-f6c8-a480-db78-727fb96348ec
* Version Independent ID: 8ee06a2a-6eda-11be-3c8e-6ad948be207e
* Content: [az keyvault](https://docs.microsoft.com/en-us/cli/azure/keyvault?view=azure-cli-latest)
* Content Source: [latest/docs-ref-autogen/keyvault.yml](https://github.com/MicrosoftDocs/azure-docs-cli/blob/main/latest/docs-ref-autogen/keyvault.yml)
* Service: **key-vault**
* GitHub Login: @rloutlaw
* Microsoft Alias: **routlaw**