Update HorizonDB 2026-10-01-preview samples

docs/dev_guide.md

@@ -46,4 +46,30 @@ Here's an example of how you can run the CLI tool:
 src/TemplateRefGenerator/bin/Debug/net10.0/TemplateRefGenerator --source-folder ../bicep-types-az/generated --output-folder ./generated
 ```
 
-To get detailed logging, use the `--verbose` flag.
+To get detailed logging, use the `--verbose` flag.
+
+## Read-only resources
+
+Read-only rendering is determined by the source resource type metadata. When
+`ResourceType.WritableScopes` is `ScopeType.None`, the generated Bicep, ARM template,
+and Terraform sections describe the resource as read-only, retain property reference
+tables, and omit deployment syntax and usage examples. No provider-specific remarks
+configuration is required. Incorrect writability metadata should be corrected
+upstream in the API specifications or type generation.
+
+## Versioning code samples
+
+Reference pages are generated for every available API version of included providers.
+To restrict a curated code sample to compatible API versions, set its optional
+`ApiVersion` property in the provider's remarks configuration:
+
+```json
+"ApiVersion": {
+  "Minimum": "2026-10-01-preview"
+}
+```
+
+`Minimum` and `Maximum` are inclusive, optional bounds. A minimum-only requirement
+includes that version and later versions, not just the latest version. Omit
+`ApiVersion` to show the sample on all versions. These filters apply to Bicep,
+ARM template, and Terraform samples without removing older reference pages.