release-notes-0.20.0: note DNS hostname support

Author: mohamedawnallah

docs/release-notes/release-notes-0.20.0.md

@@ -63,6 +63,14 @@
 # Technical and Architectural Updates
 ## BOLT Spec Updates
 
+* [Support DNS hostname address in
+  node announcement message](https://github.com/lightningnetwork/lnd/pull/9455):
+  This update allows users to announce their LND node using a DNS hostname in
+  the node announcement message, by configuring `external-dns-hostname` field in
+  the LND config file.
+  **Note:** According to BOLT 07, only one DNS hostname address may be announced
+  per node.
+
 ## Testing
 
 ## Database