docs: update release notes re empty witness data

docs/release-notes/release-notes-0.18.0.md

@@ -19,6 +19,21 @@
 
 # Bug Fixes
 
+* [Fixed a potential case](https://github.com/lightningnetwork/lnd/pull/7824)
+  that when sweeping inputs with locktime, an unexpected lower fee rate is
+  applied.
+
+* LND will now [enforce pong responses
+  ](https://github.com/lightningnetwork/lnd/pull/7828) from its peers
+
+* [Fixed a possible unintended RBF
+  attempt](https://github.com/lightningnetwork/lnd/pull/8091) when sweeping new
+  inputs with retried ones.
+
+* [Fixed](https://github.com/lightningnetwork/lnd/pull/7811) a case where `lnd`
+  might panic due to empty witness data found in a transaction. More details
+  can be found [here](https://github.com/bitcoin/bitcoin/issues/28730).
+
 # New Features
 ## Functional Enhancements