Preparing hbase release 2.4.0RC1; tagging and updates to CHANGES.md and RELEASENOTES.md

Author: apurtell

CHANGES.md

@@ -20,7 +20,7 @@
 # Be careful doing manual edits in this file. Do not change format
 # of release header or remove the below marker. This file is generated.
 # DO NOT REMOVE THIS MARKER; FOR INTERPOLATING CHANGES!-->
-## Release 2.4.0 - Unreleased (as of 2020-12-02)
+## Release 2.4.0 - Unreleased (as of 2020-12-03)
 
 
 
@@ -45,7 +45,6 @@
 
 | JIRA | Summary | Priority | Component |
 |:---- |:---- | :--- |:---- |
-| [HBASE-25246](https://issues.apache.org/jira/browse/HBASE-25246) | Backup/Restore hbase cell tags. |  Major | backup&restore |
 | [HBASE-25339](https://issues.apache.org/jira/browse/HBASE-25339) | Method parameter and member variable are duplicated in checkSplittable() of SplitTableRegionProcedure |  Minor | . |
 | [HBASE-25237](https://issues.apache.org/jira/browse/HBASE-25237) | 'hbase master stop' shuts down the cluster, not the master only |  Major | . |
 | [HBASE-25324](https://issues.apache.org/jira/browse/HBASE-25324) | Remove unnecessary array to list conversion in SplitLogManager |  Minor | . |
@@ -159,6 +158,8 @@
 
 | JIRA | Summary | Priority | Component |
 |:---- |:---- | :--- |:---- |
+| [HBASE-25355](https://issues.apache.org/jira/browse/HBASE-25355) | [Documentation]  Fix spelling error |  Trivial | documentation |
+| [HBASE-25230](https://issues.apache.org/jira/browse/HBASE-25230) | Embedded zookeeper server not clean up the old data |  Minor | Zookeeper |
 | [HBASE-25349](https://issues.apache.org/jira/browse/HBASE-25349) | [Flakey Tests] branch-2 TestRefreshRecoveredReplication.testReplicationRefreshSource:141 Waiting timed out after [60,000] msec |  Major | flakies |
 | [HBASE-25332](https://issues.apache.org/jira/browse/HBASE-25332) | one NPE |  Major | Zookeeper |
 | [HBASE-25345](https://issues.apache.org/jira/browse/HBASE-25345) | [Flakey Tests] branch-2 TestReadReplicas#testVerifySecondaryAbilityToReadWithOnFiles |  Major | test |
@@ -343,7 +344,6 @@
 | [HBASE-22033](https://issues.apache.org/jira/browse/HBASE-22033) | Update to maven-javadoc-plugin 3.2.0 and switch to non-forking aggregate goals |  Major | build, website |
 
 
-
 ## Release 2.3.0
 
 [CHANGES.md at rel/2.3.0 (e0e1382)](https://github.com/apache/hbase/blob/rel/2.3.0/CHANGES.md)