Add spacing for better code readability

Author: genan2003

device/usb-bulk-stm32-nucleo-u545re/src/main.rs

@@ -132,3 +132,11 @@ async fn main(_spawner: Spawner) {
     // If we had made everything `'static` above instead, we could do this using separate tasks instead.
     join(usb_driver, usb_read_write).await;
 }
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