az automation account | Missing managed identity capability in reference group

### Describe the bug

This GitHub issue is being moved from MicrosoftDocs/azure-docs-cli [issue 4759](https://github.com/MicrosoftDocs/azure-docs-cli/issues/4759) as it pertains to missing capabilities in reference content.
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## Engineering request
Add sytem-assigned and user-assigned identity capabilities to [az automation account](https://learn.microsoft.com/en-us/cli/azure/automation/account?view=azure-cli-latest).

## Customer feedback
**Type of issue**

Missing information

**Feedback**

Unclear how to enable system managed identity through azure cli for automation account

I try:
```
az automation account identity assign \
--resource-group $resourceGroupNameToAutomate \
--name $automationAccountName
```
but not luck. I want to turn on:


**Page URL**

https://learn.microsoft.com/en-us/cli/azure/automation/account?view=azure-cli-latest

**Content source URL**

https://github.com/MicrosoftDocs/azure-docs-cli/blob/main/latest/docs-ref-autogen/automation/account.yml

**Document Id**

c74ff008-a7d5-bf7c-e8b

### Related command

az automation account

### Errors

.

### Issue script & Debug output

.

### Expected behavior

.

### Environment Summary

Azure CLI 2.66.0

### Additional context

_No response_