docs: update release notes

Author: ViktorTigerstrom

docs/release-notes/release-notes-0.15.2.md

@@ -30,7 +30,7 @@
 ### LND
 
 * Updated [`lnd` to
-  `v0.19.3-beta.rc1`](https://github.com/lightninglabs/lightning-terminal/pull/1130).
+  `v0.19.3-beta`](https://github.com/lightninglabs/lightning-terminal/pull/1137).
 
 ### Loop