doc: add release note

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

@@ -122,6 +122,10 @@ circuit. The indices are only available for forwarding events saved after v0.20.
   to the database.
 
 ## lncli Updates
+* Previously, users could only specify one `outgoing_chan_id` when calling the 
+  `lncli queryroutes` or the QueryRoutes RPC. With this change, multiple 
+  `outgoing_chan_id` can be passed during the call.
+
 
 ## Code Health
 
@@ -155,6 +159,10 @@ reader of a payment request.
 | [`routerrpc.SendPaymentV2`](https://lightning.engineering/api-docs/api/lnd/router/send-payment-v2/index.html) | ✅ | `POST` | `/v2/router/send` |
 | [`routerrpc.TrackPaymentV2`](https://lightning.engineering/api-docs/api/lnd/router/track-payment-v2/) | ✅ | `GET` | `/v2/router/track/{payment_hash}` |
 
+* We are deprecating `OutgoingChanId` in favour of `OutgoingChanIds` in the
+  `QueryRoutes` RPC. This [transition](https://github.com/lightningnetwork/lnd/pull/10057) allows us to specify more than one outgoing channel
+  the pathfinder should use when finding a route.
+
 # Technical and Architectural Updates
 ## BOLT Spec Updates