Resolve the TODO that appears in the generated docs/content/reference/api.md at line 3251: "TODO: Can we explain where a user might find this value" for the Azure publisher field.

The docs file is auto-generated by make api-docs, so the TODO originates in the API Go type definitions under api/. The fix must be made in the API type comments, then regenerated with make api-docs.

Why

Users reading the API reference for Azure node pool images have no guidance on where to find valid publisher IDs. This leads to confusion and trial-and-error when configuring specs.

Acceptance Criteria

• Locate the TODO in the API Go type definition under api/ that produces this generated doc text
• Update the Go type comment to document where to retrieve Azure publisher IDs (e.g., Azure Portal, az vm image list-publishers CLI command)
• Add an example publisher value so readers can understand the expected format
• Remove the TODO comment from the API source
• Run make api-docs to regenerate the documentation

Technical Details

• Generated file: docs/content/reference/api.md line 3251
• Source: API Go type definitions under api/ (find the TODO matching this field)
• TODO text: "TODO: Can we explain where a user might find this value"
• Context: Azure publisher field in the API spec
• Regenerate: make api-docs