docs: update release notes

Author: ellemouton

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

@@ -59,6 +59,16 @@
   issue](https://github.com/lightningnetwork/lnd/pull/10428) in LND which might
   happen when running postgres with a limited number of connections configured.
 
+* [Add missing payment address/secret when probing an 
+  invoice](https://github.com/lightningnetwork/lnd/pull/10439). This makes sure
+  the EstimateRouteFee API can probe Eclair and LDK nodes which enforce the
+  payment address/secret.
+ 
+* Fix a bug where [missing edges for own channels could not be added to the
+  graph DB](https://github.com/lightningnetwork/lnd/pull/10443)
+  due to validation checks in the graph Builder that were resurfaced after the
+  graph refactor work.
+
 # New Features
 
 ## Functional Enhancements