Mention PR 8605 in HISTORY.md (#8619)

Summary: Pull Request resolved: #8619

Reviewed By: riversand963

Differential Revision: D30081937

Pulled By: ltamasi

fbshipit-source-id: 57505957ae2c22d4b194aa28cb3fd261b3b39919

HISTORY.md

@@ -1,4 +1,8 @@
 # Rocksdb Change Log
+## 6.23.2 (2021-08-04)
+### Bug Fixes
+* Fixed a race related to the destruction of `ColumnFamilyData` objects. The earlier logic unlocked the DB mutex before destroying the thread-local `SuperVersion` pointers, which could result in a process crash if another thread managed to get a reference to the `ColumnFamilyData` object.
+
 ## 6.23.1 (2021-07-22)
 ### Bug Fixes
 * Fix a race condition during multiple DB instances opening.