[IR] Add a kDoc for IrAnonymousInitializer

compiler/ir/ir.tree/gen/org/jetbrains/kotlin/ir/declarations/IrAnonymousInitializer.kt

@@ -16,7 +16,7 @@ import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
 /**
- * A leaf IR tree element.
+ * Represents a single `init {}` block in a Kotlin class.
  *
  * Generated from: [org.jetbrains.kotlin.ir.generator.IrTree.anonymousInitializer]
  */

compiler/ir/ir.tree/tree-generator/src/org/jetbrains/kotlin/ir/generator/IrTree.kt

@@ -329,6 +329,10 @@ object IrTree : AbstractTreeBuilder() {
     val anonymousInitializer: Element by element(Declaration) {
         parent(declarationBase)
 
+        kDoc = """
+        Represents a single `init {}` block in a Kotlin class.
+        """.trimIndent()
+
         +descriptor("ClassDescriptor") // TODO special descriptor for anonymous initializer blocks
         +symbol(anonymousInitializerSymbolType)
         +field("isStatic", boolean) {