Moved HISTORY update to correct section

HISTORY.md

@@ -21,6 +21,9 @@
 * Clarified in API comments that RocksDB is not exception safe for callbacks and custom extensions. An exception propagating into RocksDB can lead to undefined behavior, including data loss, unreported corruption, deadlocks, and more.
 * Marked `WriteBufferManager` as `final` because it is not intended for extension.
 
+### Performance Improvements
+* Released some memory related to filter construction earlier in `BlockBasedTableBuilder` for `FullFilter` and `PartitionedFilter` case (#9070)
+
 ## 6.26.0 (2021-10-20)
 ### Bug Fixes
 * Fixes a bug in directed IO mode when calling MultiGet() for blobs in the same blob file. The bug is caused by not sorting the blob read requests by file offsets.
@@ -55,7 +58,6 @@
 
 ### Performance Improvements
 * Improved CPU efficiency of building block-based table (SST) files (#9039 and #9040).
-* Released some memory related to filter construction earlier in `BlockBasedTableBuilder` for `FullFilter` and `PartitionedFilter` case (#9070)
 
 ### Java API Changes
 * Add Java API bindings for new integrated BlobDB options