References without commands in the azCLI reference TOC

### Describe the bug

Reference groups without commands are shown in the reference TOC. We need to either 1.) check for this scenario in our build process or 2.) put an enforceable reference guideline so this doesn't happen. In the interim, I am updating the _service-name.json_ files today and will remove them. This, however, is not a long-term solution.

Example link: https://learn.microsoft.com/en-us/cli/azure/service-page/azure%20voiceservices?view=azure-cli-latest
**Examples:** Azure Application Insights, Azure VoiceServices and Partner Center. Here is a screen print:

### Related command

**Azure application insights (az find) -- incorrect mapping. I am fixing this.
Azure VoiceServices (az voice-service)
Partner Center (az partnercenter)**

**This is the resulting customer experience:**

### Errors

n/a

### Issue script & Debug output

n/a

### Expected behavior

Reference groups without commands should not appear in the TOC.

### Environment Summary

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### Additional context

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