docs(json): Update Module.md to document Multiplatform support and revise examples

- Added detailed platform support for Reflection-based (JVM) and Serialization-based (Multiplatform) schema generators.
- Enhanced examples to include code snippets for Multiplatform usage with kotlinx-serialization.
- Revised feature and limitation sections for improved clarity and separation between JVM and Multiplatform implementations.

Author: kpavlov

kotlinx-schema-generator-json/Module.md

@@ -2,40 +2,73 @@
 
 Runtime JSON Schema generation from Kotlin classes and functions.
 
-Concrete implementations of schema generators for JVM runtime analysis via Kotlin reflection and kotlinx-serialization.
+Concrete implementations of schema generators using Kotlin reflection (JVM) and kotlinx-serialization (Multiplatform).
 
-**Platform Support:** JVM only (requires Kotlin reflection) • Kotlin 2.2+
+**Platform Support:**
+- **Multiplatform**: Transformers and serialization-based generators (Common)
+- **JVM only**: Reflection-based generators (require kotlin-reflect)
 
 ## Generators
 
+### Reflection-Based (JVM Only)
+
 - [ReflectionClassJsonSchemaGenerator] - generates schemas from any KClass via reflection
 - [ReflectionFunctionCallingSchemaGenerator] - generates function calling schemas from KCallable
-- [SerializationClassJsonSchemaGenerator] - generates schemas from @Serializable classes
 
-## Example
+### Serialization-Based (Multiplatform)
+
+- [SerializationClassJsonSchemaGenerator] - generates schemas from @Serializable classes (works on JVM, Native, JS, Wasm)
+
+## Examples
+
+### Reflection Generator (JVM)
 
 ```kotlin
 // Class schema generation
 val generator = ReflectionClassJsonSchemaGenerator.Default
 val schema: JsonObject = generator.generateSchema(User::class)
 
-// Function schema generation
+// Function calling schema generation
 val funcGenerator = ReflectionFunctionCallingSchemaGenerator.Default
 val funcSchema = funcGenerator.generateSchema(::myFunction)
 ```
 
+### Serialization Generator (Multiplatform)
+
+```kotlin
+import kotlinx.serialization.Serializable
+import kotlinx.schema.generator.json.serialization.SerializationClassJsonSchemaGenerator
+
+@Serializable
+data class User(val name: String, val email: String? = null)
+
+val generator = SerializationClassJsonSchemaGenerator.Default
+val schema = generator.generateSchema(User.serializer().descriptor)
+```
+
 ## Features
 
+**Reflection Generators (JVM only):**
 - Analyze third-party classes without source modification
 - Extract default values from data class properties
-- Recognize foreign annotations (Jackson, LangChain4j, Koog)
+- Recognize foreign annotations (Jackson, Koog, LangChain4j)
 - OpenAI/Anthropic function calling format
 - Sealed class hierarchies with `oneOf`
 
+**Serialization Generators (Multiplatform):**
+- Works on all kotlinx-serialization targets (JVM, Native, JS, Wasm)
+- Consistent with kotlinx-serialization behavior
+
 ## Limitations
 
-- KDoc annotations not available at runtime
+**Reflection Generators:**
 - Function parameter defaults cannot be extracted (data class property defaults work)
+- JVM only
+
+**Serialization Generators:**
+- Requires `@Serializable` annotation
+- Cannot extract actual default values (only detects presence)
+- Cannot extract descriptions, because of the `SerialDescriptor` limitation 
 
 # Package kotlinx.schema.generator.json