Minor javadoc improvements

src/main/java/com/fasterxml/jackson/core/JsonStreamContext.java

@@ -17,6 +17,8 @@
  * being processed. This allows for some contextual processing: for
  * example, output within Array context can differ from that of
  * Object context.
+ *<p>
+ * NOTE: in Jackson 3.x this class is renamed as {@code TokenStreamContext}
  */
 public abstract class JsonStreamContext
 {

src/main/java/com/fasterxml/jackson/core/JsonToken.java

@@ -56,7 +56,9 @@ public enum JsonToken
 
     /**
      * FIELD_NAME is returned when a String token is encountered
-     * as a field name (same lexical value, different function)
+     * as a field name (same lexical value, different function).
+     *<p>
+     * NOTE: in Jackson 3.x this enum is renamed as {@code PROPERTY_NAME}
      */
     FIELD_NAME(null, JsonTokenId.ID_FIELD_NAME),
 

src/main/java/com/fasterxml/jackson/core/JsonTokenId.java

@@ -47,6 +47,8 @@ public interface JsonTokenId
 
     /**
      * Id used to represent {@link JsonToken#FIELD_NAME}
+     *<p>
+     * NOTE: in Jackson 3.x this enum is renamed as {@code ID_PROPERTY_NAME}
      */
     public final static int ID_FIELD_NAME = 5;