Merge pull request #843 from lightninglabs/docs-lnd

Update lnd documentation

Author: github-actions[bot]

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

@@ -31,6 +31,14 @@
 # Improvements
 ## Functional Updates
 
+* Graph Store SQL implementation and migration project:
+  * Introduce an [abstract graph 
+    store](https://github.com/lightningnetwork/lnd/pull/9791) interface. 
+  * Start [validating](https://github.com/lightningnetwork/lnd/pull/9787) that 
+    byte blobs at the end of gossip messages are valid TLV streams.
+  * Various [preparations](https://github.com/lightningnetwork/lnd/pull/9692) 
+    of the graph code before the SQL implementation is added.
+
 ## RPC Updates
 
 ## lncli Updates