Add version changes in StdTypeResolverBuilder

Author: JooHyukKim

src/main/java/com/fasterxml/jackson/databind/jsontype/impl/StdTypeResolverBuilder.java

@@ -35,7 +35,10 @@ public class StdTypeResolverBuilder
      * Whether type id should be exposed to deserializers or not
      */
     protected boolean _typeIdVisible = false;
-    
+
+    /**
+     * @since 2.16 (backported from Jackson 3.0)
+     */
     protected Boolean _requireTypeIdForSubtypes;
 
     /**
@@ -56,6 +59,9 @@ public class StdTypeResolverBuilder
 
     public StdTypeResolverBuilder() { }
 
+    /**
+     * @since 2.16 (backported from Jackson 3.0)
+     */
     public StdTypeResolverBuilder(JsonTypeInfo.Value settings) {
         if (settings != null) {
             _idType = settings.getIdType();
@@ -70,6 +76,9 @@ public StdTypeResolverBuilder(JsonTypeInfo.Value settings) {
         }
     }
 
+    /**
+     * @since 2.16 (backported from Jackson 3.0)
+     */ 
     protected static String _propName(String propName, JsonTypeInfo.Id idType) {
         if (propName == null) {
             propName = idType.getDefaultPropertyName();