doc: add release notes for version 3 transactions

doc/release-notes-32896.md

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+Updated RPCs
+------------
+The following RPCs now contain a `version` parameter that allows
+the user to create transactions of any standard version number (1-3):
+- `createrawtransaction`
+- `createpsbt`
+- `send`
+- `sendall`
+- `walletcreatefundedpsbt`
+
+Wallet
+------
+Support has been added for spending TRUC transactions received by the
+wallet, as well as creating TRUC transactions. The wallet ensures that
+TRUC policy rules are being met. The wallet will throw an error if the
+user is trying to spend TRUC utxos with utxos of other versions.
+Additionally, the wallet will treat unconfirmed TRUC sibling
+transactions as mempool conflicts. The wallet will also ensure that
+transactions spending TRUC utxos meet the required size restrictions.