docs: add 0.16.0 release notes

docs/release-notes/release-notes-0.16.0.md

@@ -97,6 +97,9 @@ current gossip sync query status.
   the `dev` tag, and configured to [opt into overriding a specific message 
   type](https://github.com/lightningnetwork/lnd/pull/7153)
 
+* [Sign/Verify messages and signatures for single
+  addresses](https://github.com/lightningnetwork/lnd/pull/7231).
+
 ## Wallet
 
 * [Allows Taproot public keys and tap scripts to be imported as watch-only
@@ -282,6 +285,9 @@ in the lnwire package](https://github.com/lightningnetwork/lnd/pull/7303)
   link is falling behind, which is now fixed by [retrying the enable
   request](https://github.com/lightningnetwork/lnd/pull/7157). 
 
+* [Sign/Verify messages and signatures for single
+  addresses](https://github.com/lightningnetwork/lnd/pull/7231).
+
 ## Code Health
 
 * [test: use `T.TempDir` to create temporary test