docs: update release notes

Author: yyforyongyu

docs/release-notes/release-notes-0.19.1.md

@@ -34,6 +34,10 @@
 - Fixed [a case](https://github.com/lightningnetwork/lnd/pull/9890) where LND
   would crash because of misaligned of a data struct on 32 bit systems.
 
+- Fixed [a case](https://github.com/lightningnetwork/lnd/pull/9876) where a peer
+  may be treated as restricted peer although it used to have a channel with the
+  node.
+
 # New Features
 
 ## Functional Enhancements