Update libs/cardano-ledger-core/CHANGELOG.md

Co-authored-by: Alexey Kuleshevich <alexey.kuleshevich@iohk.io>

Author: Soupstraw

libs/cardano-ledger-core/CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## 1.18.0.0
 
-* Changed `sizeTxF` and `sizeTxForFeeCalculation` to use `Word64`
+* Changed `sizeTxF` and `sizeTxForFeeCalculation` to use `Word32`
 * Move pool deposits from `PState` into `StakePoolState`. #5234
   * Add `spsDeposit` field to `StakePoolState`
   * Remove `psDeposits` field from `PState` data constructor