Update @JsonInclude as per databind#5369 (#331)

Author: JooHyukKim

src/main/java/com/fasterxml/jackson/annotation/JsonInclude.java

@@ -45,9 +45,15 @@
  *<p>
  * In addition to {@code Map}s, {@code content} concept is also supported for referential
  * types (like {@link java.util.concurrent.atomic.AtomicReference}).
- * Note that `content` is NOT currently (as of Jackson 2.20) supported for
+ *<pre>
+ * (For Jackson 2 only) Note that `content` is NOT currently (as of Jackson 2.20) supported for
  * arrays or {@link java.util.Collection}s; support may be added in
  * future versions (but if so, will be configurable to allow disabling it).
+ *<pre>
+ * (For Jackson 3 only) As of Jackson 3.1.0, {@link #content()} also supports {@link java.util.Collection}'s
+ * when {@code tools.jackson.databind.SerializationFeature#APPLY_JSON_INCLUDE_FOR_COLLECTIONS}
+ * feature is enabled --disabled by default for backward-compatibility. (see [databind#5369] for more detail)
+ * Note that `content` is NOT currently (as of Jackson 3.1.0) supported for arrays, but may be supported in future versions.
  *
  * @since 2.0
  */