rust: rbtree: fix minor typos in comments

index b8fe6be6fcc4..6c9708201fd7 100644
@@ -732,7 +732,7 @@ pub struct Cursor<'a, K, V> {
 }
 
 // SAFETY: The [`Cursor`] has exclusive access to both `K` and `V`, so it is sufficient to require them to be `Send`.
-// The cursor only gives out immutable references to the keys, but since it has excusive access to those same
+// The cursor only gives out immutable references to the keys, but since it has exclusive access to those same
 // keys, `Send` is sufficient. `Sync` would be okay, but it is more restrictive to the user.
 unsafe impl<'a, K: Send, V: Send> Send for Cursor<'a, K, V> {}
 

@@ -980,7 +980,7 @@ pub struct IterMut<'a, K, V> {
 }
 
 // SAFETY: The [`IterMut`] has exclusive access to both `K` and `V`, so it is sufficient to require them to be `Send`.
-// The iterator only gives out immutable references to the keys, but since the iterator has excusive access to those same
+// The iterator only gives out immutable references to the keys, but since the iterator has exclusive access to those same
 // keys, `Send` is sufficient. `Sync` would be okay, but it is more restrictive to the user.
 unsafe impl<'a, K: Send, V: Send> Send for IterMut<'a, K, V> {}