Update HISTORY for reverts

diff --git a/HISTORY.md b/HISTORY.md
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--- a/HISTORY.md
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@@ -1,4 +1,7 @@
 # Rocksdb Change Log
+## Unreleased
+* Revert an internal change in 7.8.0 associated with some memory usage churn.
+
 ## 7.8.2 (11/27/2022)
 ### Behavior changes
 * Make best-efforts recovery verify SST unique ID before Version construction (#10962)