Update comments based on feedback.

Author: wedsonaf

drivers/char/rust_example.rs

@@ -67,9 +67,9 @@ struct SharedState {
 impl SharedState {
     fn try_new() -> KernelResult<Arc<Self>> {
         let state = Arc::try_new(Self {
-            // SAFETY: Init is called below.
+            // SAFETY: `condvar_init!` is called below.
             state_changed: unsafe { CondVar::new() },
-            // SAFETY: Init is called below.
+            // SAFETY: `mutex_init!` is called below.
             inner: unsafe { Mutex::new(SharedStateInner { token_count: 0 }) },
         })?;
         // SAFETY: `state_changed` is pinned behind `Arc`.