az network application-gateway http listener --host-names

I've run [this command](https://docs.microsoft.com/en-us/cli/azure/network/application-gateway/http-listener?view=azure-cli-latest#az_network_application_gateway_http_listener_create-examples) to create a new http listener, specifying the `--host-names` argument with a space seperated list of domain names.

This ran successfully.

However when viewing the resource in the Azure Portal, the host names appear all on a single line rather than on seperate lines, making me think it hasn't been configured correctly.


I am raising this here because I am not sure if the "space seperated" --host-names argument is documented incorrectly - causing this bug (i.e perhaps it should be comma seperated?) or if there is some other bug, or perhaps just an azure portal display issue.

---
#### Document Details

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* ID: 2dce00db-c8d7-9b93-7ac8-114a500a6a34
* Version Independent ID: 14a03192-a30b-d273-fa11-32413868a5fa
* Content: [az network application-gateway http-listener](https://docs.microsoft.com/en-us/cli/azure/network/application-gateway/http-listener?view=azure-cli-latest)
* Content Source: [latest/docs-ref-autogen/network/application-gateway/http-listener.yml](https://github.com/MicrosoftDocs/azure-docs-cli/blob/master/latest/docs-ref-autogen/network/application-gateway/http-listener.yml)
* Service: **virtual-network**
* GitHub Login: @rloutlaw
* Microsoft Alias: **routlaw**