doc: release-notes-0.20.0

Author: MPins

docs/release-notes/release-notes-0.20.0.md

@@ -71,6 +71,11 @@ circuit. The indices are only available for forwarding events saved after v0.20.
   have a slow network.
 
 
+* Added [`deletecanceledinvoices`](
+  https://github.com/lightningnetwork/lnd/pull/9625) RPC to allow the removal of
+  a canceled invoice. Supports deleting a canceled invoice by providing its
+  payment hash.
+
 ## lncli Additions
 
 * [`lncli sendpayment` and `lncli queryroutes` now support the