f - Use hidden FakeLogger in docs

Author: jkczyz

lightning-rapid-gossip-sync/src/lib.rs

@@ -30,11 +30,16 @@
 //! use bitcoin::blockdata::constants::genesis_block;
 //! use bitcoin::Network;
 //! use lightning::routing::gossip::NetworkGraph;
-//! use lightning::util::test_utils::TestLogger;
 //! use lightning_rapid_gossip_sync::RapidGossipSync;
 //!
+//! # use lightning::util::logger::{Logger, Record};
+//! # struct FakeLogger {}
+//! # impl Logger for FakeLogger {
+//! #     fn log(&self, record: &Record) { unimplemented!() }
+//! # }
+//! # let logger = FakeLogger {};
+//!
 //! let block_hash = genesis_block(Network::Bitcoin).header.block_hash();
-//! let logger = TestLogger::new();
 //! let network_graph = NetworkGraph::new(block_hash, &logger);
 //! let rapid_sync = RapidGossipSync::new(&network_graph);
 //! let new_last_sync_timestamp_result = rapid_sync.sync_network_graph_with_file_path("./rapid_sync.lngossip");