multi: Fix typos [skip ci]

rpcserver.go

@@ -5795,7 +5795,7 @@ func (r *rpcServer) GetNodeInfo(ctx context.Context,
 
 // QueryRoutes attempts to query the daemons' Channel Router for a possible
 // route to a target destination capable of carrying a specific amount of
-// satoshis within the route's flow. The retuned route contains the full
+// satoshis within the route's flow. The returned route contains the full
 // details required to craft and send an HTLC, also including the necessary
 // information that should be present within the Sphinx packet encapsulated
 // within the HTLC.