docs: add release notes for improved accessman

Author: yyforyongyu

docs/release-notes/release-notes-0.19.2.md

@@ -38,6 +38,10 @@
 
 ## Functional Updates
 
+- [Improved](https://github.com/lightningnetwork/lnd/pull/9880) the connection
+  restriction logic enforced by `accessman`. In addition, the restriction placed
+  on outbound connections is now lifted.
+
 ## RPC Updates
 
 ## lncli Updates
@@ -63,5 +67,4 @@
 ## Tooling and Documentation
 
 # Contributors (Alphabetical Order)
-
 * Yong Yu