fix: cargo fmt

Author: pradovic

libp2p/src/tutorials/ping.rs

@@ -232,7 +232,9 @@
 //!             yamux::Config::default,
 //!         )?
 //!         .with_behaviour(|_| ping::Behaviour::default())?
-//!         .with_swarm_config(|cfg| cfg.with_idle_connection_timeout(Duration::from_secs(u64::MAX))) // Allows us to observe pings indefinitely.
+//!         .with_swarm_config(|cfg| {
+//!             cfg.with_idle_connection_timeout(Duration::from_secs(u64::MAX))
+//!         }) // Allows us to observe pings indefinitely.
 //!         .build();
 //!
 //!     Ok(())
@@ -285,7 +287,9 @@
 //!             yamux::Config::default,
 //!         )?
 //!         .with_behaviour(|_| ping::Behaviour::default())?
-//!         .with_swarm_config(|cfg| cfg.with_idle_connection_timeout(Duration::from_secs(u64::MAX))) // Allows us to observe pings indefinitely.
+//!         .with_swarm_config(|cfg| {
+//!             cfg.with_idle_connection_timeout(Duration::from_secs(u64::MAX))
+//!         }) // Allows us to observe pings indefinitely.
 //!         .build();
 //!
 //!     // Tell the swarm to listen on all interfaces and a random, OS-assigned
@@ -331,7 +335,9 @@
 //!             yamux::Config::default,
 //!         )?
 //!         .with_behaviour(|_| ping::Behaviour::default())?
-//!         .with_swarm_config(|cfg| cfg.with_idle_connection_timeout(Duration::from_secs(u64::MAX))) // Allows us to observe pings indefinitely.
+//!         .with_swarm_config(|cfg| {
+//!             cfg.with_idle_connection_timeout(Duration::from_secs(u64::MAX))
+//!         }) // Allows us to observe pings indefinitely.
 //!         .build();
 //!
 //!     // Tell the swarm to listen on all interfaces and a random, OS-assigned