Update BackgroundProcessor persist API doc

Author: jurvis

lightning-background-processor/src/lib.rs

@@ -131,20 +131,19 @@ impl BackgroundProcessor {
 	/// documentation].
 	///
 	/// The thread runs indefinitely unless the object is dropped, [`stop`] is called, or
-	/// `persist_manager` returns an error. In case of an error, the error is retrieved by calling
+	/// [`Persister::persist_manager`] returns an error. In case of an error, the error is retrieved by calling
 	/// either [`join`] or [`stop`].
 	///
 	/// # Data Persistence
 	///
-	/// `persist_manager` is responsible for writing out the [`ChannelManager`] to disk, and/or
+	/// [`Persister::persist_manager`] is responsible for writing out the [`ChannelManager`] to disk, and/or
 	/// uploading to one or more backup services. See [`ChannelManager::write`] for writing out a
 	/// [`ChannelManager`]. See [`FilesystemPersister::persist_manager`] for Rust-Lightning's
 	/// provided implementation.
 	///
-	/// `persist_graph` is responsible for writing out the [`NetworkGraph`] to disk. See
-	/// [`NetworkGraph::write`] for writing out a [`NetworkGraph`]. See
-	/// [`FilesystemPersister::persist_network_graph`] for Rust-Lightning's
-	/// provided implementation.
+	/// [`Persister::persist_graph`] is responsible for writing out the [`NetworkGraph`] to disk. See
+	/// [`NetworkGraph::write`] for writing out a [`NetworkGraph`]. See [`FilesystemPersister::persist_network_graph`]
+	/// for Rust-Lightning's provided implementation.
 	///
 	/// Typically, users should either implement [`Persister::persist_manager`] to never return an
 	/// error or call [`join`] and handle any error that may arise. For the latter case,