fix accidental rename

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

examples/examples/tower-load.rs

@@ -37,7 +37,7 @@ use tracing_subscriber::FmtSubscriber;
 fn main() {
     let builder = FmtSubscriber::builder()
         .with_env_filter("info,tower_load=debug")
-        .with_env_filter_reloading();
+        .with_filter_reloading();
     let handle = builder.reload_handle();
 
     let _ = tracing::subscriber::set_global_default(builder.finish());