docs/release-notes: add entry for 0.15.5

Adds an entry for the change addr bug fix, and a missing entry for the
funding locked sleep fix.

Author: Roasbeef

docs/release-notes/release-notes-0.15.5.md

@@ -5,11 +5,15 @@
 * [A Taproot related key tweak issue was fixed in `btcd` that affected remote
   signing setups](https://github.com/lightningnetwork/lnd/pull/7130).
 
-* [Sleep for one second when funding locked message is not
-  received](https://github.com/lightningnetwork/lnd/pull/7095) to avoid CPU
-  spike.
+* [Taproot changes addresses are now used by default for the `SendCoins`
+  RPC](https://github.com/lightningnetwork/lnd/pull/7193).
+
+* [A 1 second interval has been added between `FundingLocked` receipt
+  checks](https://github.com/lightningnetwork/lnd/pull/7095). This reduces idle
+  CPU usage for pending/dangling funding attempts.
 
 # Contributors (Alphabetical Order)
 
+* Olaoluwa Osuntokun
 * Oliver Gugger
 * Yong Yu