Merge pull request #18804 from ahrtr/changelog_20241029

Update 3.5 changelog to cover two major fixes

Author: ahrtr

CHANGELOG/CHANGELOG-3.5.md

@@ -5,6 +5,10 @@ Previous change logs can be found at [CHANGELOG-3.4](https://github.com/etcd-io/
 
 ## v3.5.17 (TBC)
 
+### etcd server
+- Fix [watchserver related goroutine leakage](https://github.com/etcd-io/etcd/pull/18784)
+- Fix [risk of a partial write txn being applied](https://github.com/etcd-io/etcd/pull/18799)
+
 ### Dependencies
 - Compile binaries using [go 1.22.8](https://github.com/etcd-io/etcd/pull/18669).