cfg: fail startup on flags.Error parsing error

docs/release-notes/release-notes-0.18.1.md

@@ -22,10 +22,13 @@
 * `closedchannels` now [successfully reports](https://github.com/lightningnetwork/lnd/pull/8800)
   settled balances even if the delivery address is set to an address that
   LND does not control.
- 
+
 * [SendPaymentV2](https://github.com/lightningnetwork/lnd/pull/8734) now cancels
   the background payment loop if the user cancels the stream context.
 
+* [Fixed a bug](https://github.com/lightningnetwork/lnd/pull/8822) that caused
+  LND to read the config only partially and continued with the startup.
+
 # New Features
 ## Functional Enhancements
 ## RPC Additions