Fix timeout call in example doc

Author: EddieHouston

examples/JWT_AUTH_EXAMPLE.md

@@ -157,12 +157,13 @@ To use with BDK, create the electrum client with your config, then wrap it:
 use bdk_electrum::BdkElectrumClient;
 use electrum_client::{Client, ConfigBuilder};
 use std::sync::Arc;
+use std::time::Duration;
 
 let config = ConfigBuilder::new()
     .authorization_provider(Some(Arc::new(move || {
         token_manager.get_token()
     })))
-    .timeout(Some(30))
+    .timeout(Some(Duration::from_secs(30)))
     .build();
 
 let electrum_client = Client::from_config("tcp://your-api-gateway:50001", config)?;