docs: add release notes entry

Author: ellemouton

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

@@ -94,6 +94,7 @@ circuit. The indices are only available for forwarding events saved after v0.20.
     * [11](https://github.com/lightningnetwork/lnd/pull/9972)
   * Add graph SQL migration logic:
     * [1](https://github.com/lightningnetwork/lnd/pull/10036)
+    * [2](https://github.com/lightningnetwork/lnd/pull/10037)
 
 ## RPC Updates
 * Previously the `RoutingPolicy` would return the inbound fee record in its