Add Javadoc notes on some of entity renamings in Jackson 3.0

src/main/java/com/fasterxml/jackson/databind/AnnotationIntrospector.java

@@ -1420,7 +1420,8 @@ public JsonCreator.Mode findCreatorAnnotation(MapperConfig<?> config, Annotated
      * NOTE: naming of this method is unfortunately inconsistent in that "default Creator"
      * has other meanings than "primary Creator" -- in other places Jackson code
      * refers to no-arguments Constructors as "default Creators". So this method
-     * ought to have been named {@code findPrimaryCreator()}.
+     * ought to have been named {@code findPreferredCreator()} (and will in fact
+     * be renamed as such in Jackson 3.0).
      *
      * @param config Configuration settings in effect (for deserialization)
      * @param valueClass Class being instantiated; defines Creators passed

src/main/java/com/fasterxml/jackson/databind/JsonSerializable.java

@@ -18,6 +18,8 @@
  * Note that while it is possible to just directly implement {@link JsonSerializable},
  * actual implementations are strongly recommended to instead extend
  * {@link JsonSerializable.Base}.
+ *<p>
+ * NOTE: in Jackson 3.x this class will be renamed as {@code JacksonSerializable}
  */
 public interface JsonSerializable
 {

src/main/java/com/fasterxml/jackson/databind/Module.java

@@ -21,6 +21,9 @@
  * Simple interface for extensions that can be registered with {@link ObjectMapper}
  * to provide a well-defined set of extensions to default functionality; such as
  * support for new data types.
+ *<p>
+ * NOTE: in Jackson 3.x this class will be renamed as {@code JacksonModule}
+ * to avoid naming conflict with JDK 9's {@code java.lang.module.Module}.
  */
 public abstract class Module
     implements Versioned

src/main/java/com/fasterxml/jackson/databind/SerializerProvider.java

@@ -47,6 +47,10 @@
  * {@link com.fasterxml.jackson.databind.ser.DefaultSerializerProvider}.
  * Only this instance can be used for actual serialization calls; blueprint
  * object is only to be used for creating instances.
+ *<p>
+ * NOTE: in Jackson 3.x this class will be renamed as {@code SerializationContext}
+ * to align with {@link DeserializationContext}.
+ *
  */
 public abstract class SerializerProvider
     extends DatabindContext