docs: update release-notes for 0.19.0

Author: starius

docs/release-notes/release-notes-0.19.0.md

@@ -118,6 +118,10 @@ keysend payment validation is stricter.
 * [Fixed](https://github.com/lightningnetwork/lnd/pull/9746) a possible panic
 when running LND with an aux component injected (custom channels).
 
+* [Fixed a bug](https://github.com/lightningnetwork/lnd/pull/9750): if a Taproot
+  address is added to LND using the `ImportTapscript` RPC, LND previously failed
+  to perform a cooperative close to that address.
+
 # New Features
 
 * Add support for [archiving channel backup](https://github.com/lightningnetwork/lnd/pull/9232)