Update typo in appi-1.kql (#106)

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# Overview/Summary

Update VMSS-8 resources section to include link to new preview capability for VMSS zonal expansion

## This PR fixes/adds/changes/removes

1. Add link to public doc for VMSS-8

### Breaking Changes

1. None

## As part of this Pull Request I have

- [x] Read the [Contribution Guide](https://azure.github.io/Azure-Proactive-Resiliency-Library/contributing) and ensured this PR is compliant with the guide
- [x] Checked for duplicate [Pull Requests](https://github.com/Azure/Azure-Proactive-Resiliency-Library/pulls)
- [x] Associated it with relevant [GitHub Issues](https://github.com/Azure/Azure-Proactive-Resiliency-Library/issues) or ADO Work Items (Internal Only)
- [ ] Ensured my code/branch is up-to-date with the latest changes in the `main` [branch](https://github.com/Azure/Azure-Proactive-Resiliency-Library/tree/main)
- [ ] Ensured PR tests are passing
- [ ] Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)

docs/content/services/compute/virtual-machine-scale-sets/_index.md

@@ -226,6 +226,7 @@ When you create your VMSS, use availability zones to protect your applications a
 **Resources**
 
 - [Create a Virtual Machine Scale Set that uses Availability Zones](https://learn.microsoft.com/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-use-availability-zones)
+- [Update scale set to add availability zones](https://learn.microsoft.com/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-use-availability-zones?tabs=cli-1%2Cportal-2#update-scale-set-to-add-availability-zones)
 
 **Resource Graph Query/Scripts**