fix: ping tutorial - 10s default timeout

Author: pradovic

libp2p/src/tutorials/ping.rs

@@ -205,12 +205,12 @@
 //! ## Idle connection timeout
 //!
 //! Now, for this example in particular, we need set the idle connection timeout.
-//! Otherwise, the connection will be closed immediately.
+//! The default connection timeout is 10 seconds.
 //!
 //! Whether you need to set this in your application too depends on your usecase.
 //! Typically, connections are kept alive if they are "in use" by a certain protocol.
 //! The ping protocol however is only an "auxiliary" kind of protocol.
-//! Thus, without any other behaviour in place, we would not be able to observe the pings.
+//! Thus, without any other behaviour in place, we would not be able to observe any pings after 10s.
 //!
 //! ```rust
 //! use std::{error::Error, time::Duration};