Update repeat.rs

library/core/src/iter/sources/repeat.rs

@@ -7,7 +7,7 @@ use crate::num::NonZero;
 ///
 /// Infinite iterators like `repeat()` are often used with adapters like
 /// [`Iterator::take()`], in order to make them finite.
-/// 
+///
 /// > Please prefer [`str::repeat()`] over this function if you just want
 /// > to repeat a char/string `n`th times.
 ///