Fix "file must end with a newline"

Author: chorman0773

src/type-layout.md

@@ -761,4 +761,4 @@ used with any other representation.
 [`Layout`]: std::alloc::Layout
 [type.pointer.reference.shared]: types/pointer.md#shared-references-
 [type.pointer.reference.mut]: types/pointer.md#mutable-references-mut
-[type.fn-pointer]: types/function-pointer.md
+[type.fn-pointer]: types/function-pointer.md