config: fix path to bitcoind.rpccookie and bitcoind.config

docs/release-notes/release-notes-0.15.0.md

@@ -260,6 +260,9 @@ from occurring that would result in an erroneous force close.](https://github.co
 
 * [Clarify error msg when bitcoind cookie file is missing](https://github.com/lightningnetwork/lnd/pull/6536).
 
+* [Minor fix](https://github.com/lightningnetwork/lnd/pull/6535) to
+  how bitcoind.rpccookie and bitocind.config are parsed from config file.
+
 ## RPC Server
 
 * [Add value to the field