Fix persist_graph docs to caller’s perspective

Author: jurvis

lightning-background-processor/src/lib.rs

@@ -98,7 +98,7 @@ where
 	/// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
 	fn persist_manager(&self, channel_manager: &ChannelManager<Signer, M, T, K, F, L>) -> Result<(), std::io::Error>;
 
-	/// Persist the given [`NetworkGraph`] to disk, logging an error if persistence failed.
+	/// Persist the given [`NetworkGraph`] to disk, returning an error if persistence failed.
 	///
 	/// [`NetworkGraph`]: lightning::routing::network_graph::NetworkGraph
 	fn persist_graph(&self, network_graph: &NetworkGraph) -> Result<(), std::io::Error>;