Add release notes for importing key origin info change

doc/release-notes-14021.md

@@ -0,0 +1,11 @@
+Miscellaneous RPC Changes
+-------------------------
+- Descriptors with key origin information imported through `importmulti` will have their key origin information stored in the wallet for use with creating PSBTs.
+- If `bip32derivs` of both `walletprocesspsbt` and `walletcreatefundedpsbt` is set to true but the key metadata for a public key has not been updated yet, then that key will have a derivation path as if it were just an independent key (i.e. no derivation path and its master fingerprint is itself)
+
+Miscellaneous Wallet changes
+----------------------------
+
+- The key metadata will need to be upgraded the first time that the HD seed is available.
+For unencrypted wallets this will occur on wallet loading.
+For encrypted wallets this will occur the first time the wallet is unlocked.