docs: add release note

Author: Abdulkbk

docs/release-notes/release-notes-0.20.1.md

@@ -92,6 +92,12 @@
   safe single-writer behavior until the wallet subsystem is fully 
   concurrent-safe.
 
+* [Add caching for](https://github.com/lightningnetwork/lnd/pull/10363)
+`IsPublicNode` query which speedup calls to check for nodes visibility status.
+This reduces the amount of time lnd needs to query the db to determine if a node
+is public or not. Also added a new config `caches.public-node-cache-size` which
+controls the max number of entries that the cache can accommodate.
+
 ## Deprecations
 
 # Technical and Architectural Updates
@@ -107,5 +113,6 @@
 
 # Contributors (Alphabetical Order)
 
+* Abdulkbk
 * bitromortac
 * Ziggie