HBASE-28648 Change the deprecation cycle for RegionObserver.postInstantiateDeleteTracker (apache#6133)

Signed-off-by: Duo Zhang <[email protected]>

Author: 2005hithlj

hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionObserver.java

@@ -1567,7 +1567,8 @@ default List<Pair<Cell, Cell>> postAppendBeforeWAL(
    * @param ctx        the environment provided by the region server
    * @param delTracker the deleteTracker that is created by the QueryMatcher
    * @return the Delete Tracker
-   * @deprecated Since 2.0 with out any replacement and will be removed in 3.0
+   * @deprecated Since 2.0.0, will be removed in 4.0.0. Visibility label feature still use this
+   *             method, so it can not be removed in 3.0.0
    */
   @Deprecated
   default DeleteTracker postInstantiateDeleteTracker(