Update library/core/src/iter/adapters/intersperse.rs

Co-authored-by: Josh Stone <cuviper@gmail.com>

Author: nyurik

library/core/src/iter/adapters/intersperse.rs

@@ -1,5 +1,5 @@
-use core::fmt;
-use core::iter::{Fuse, FusedIterator};
+use crate::fmt;
+use crate::iter::{Fuse, FusedIterator};
 
 /// An iterator adapter that places a separator between all elements.
 ///