f - expand doc example

Author: jkczyz

lightning/src/routing/scorer.rs

@@ -35,7 +35,9 @@
 //!
 //! // Or use custom channel penalties.
 //! let scorer = Scorer::new(ScoringParameters {
-//!     base_penalty_msat: 1000, ..ScoringParameters::default()
+//!     base_penalty_msat: 1000,
+//!     failure_penalty_msat: 2 * 1024 * 1000,
+//!     ..ScoringParameters::default()
 //! });
 //!
 //! let route = find_route(&payer, &params, &network_graph, None, &logger, &scorer);