Minor grammar nit.

Author: uberFoo

Diff for: library/core/src/borrow.rs

@@ -26,7 +26,7 @@
 /// to be modified, it can additionally implement [`BorrowMut<T>`].
 ///
 /// Further, when providing implementations for additional traits, it needs
-/// to be considered whether they should behave identical to those of the
+/// to be considered whether they should behave identically to those of the
 /// underlying type as a consequence of acting as a representation of that
 /// underlying type. Generic code typically uses `Borrow<T>` when it relies
 /// on the identical behavior of these additional trait implementations.