Update HISTORY.md for #9009 (#9036)

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9036

Reviewed By: zhichao-cao

Differential Revision: D31640901

Pulled By: ajkr

fbshipit-source-id: 0b1e6e36094a74bb7906af44e29ecbeaa258de58

HISTORY.md

@@ -6,6 +6,8 @@
 * Fix `DisableManualCompaction()` to cancel compactions even when they are waiting on automatic compactions to drain due to `CompactRangeOptions::exclusive_manual_compactions == true`.
 * Fix contract of `Env::ReopenWritableFile()` and `FileSystem::ReopenWritableFile()` to specify any existing file must not be deleted or truncated.
 * Fixed bug in calls to `IngestExternalFiles()` with files for multiple column families. The bug could have introduced a delay in ingested file keys becoming visible after `IngestExternalFiles()` returned. Furthermore, mutations to ingested file keys while they were invisible could have been dropped (not necessarily immediately).
+* Fixed a possible race condition impacting users of `WriteBufferManager` who constructed it with `allow_stall == true`. The race condition led to undefined behavior (in our experience, typically a process crash).
+* Fixed a bug where stalled writes would remain stalled forever after the user calls `WriteBufferManager::SetBufferSize()` with `new_size == 0` to dynamically disable memory limiting.
 
 ### New Features
 * Print information about blob files when using "ldb list_live_files_metadata"