Required parameters aren't accurate

for `az kusto data-connection event-grid create` we show only `cluster-name`,`data-connection-name`,`database-name`,`resource-group` are required. However running the command w/ only those 4 gives you:

~~~
(BadRequest) One or more mandatory properties are missing.
~~~

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#### Document Details

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* ID: 607c986e-02c6-93b9-57cc-9c6c10af7f48
* Version Independent ID: 454469af-535d-b37a-0ad2-40fc49f7a76c
* Content: [az kusto data-connection event-grid](https://docs.microsoft.com/en-us/cli/azure/ext/kusto/kusto/data-connection/event-grid?view=azure-cli-latest#ext-kusto-az-kusto-data-connection-event-grid-create)
* Content Source: [latest/docs-ref-autogen/ext/kusto/kusto/data-connection/event-grid.yml](https://github.com/MicrosoftDocs/azure-docs-cli/blob/live/latest/docs-ref-autogen/ext/kusto/kusto/data-connection/event-grid.yml)
* GitHub Login: @rloutlaw
* Microsoft Alias: **routlaw**