Correct sentence about unsized coercions
@@ -140,7 +140,7 @@ Coercion is allowed between the following types:
- `*mut T`
- `Box<T>`
- and where `T` can obtained from `U` by [unsized coercion](#unsized-coercions).
+ and where `U` can be obtained from `T` by [unsized coercion](#unsized-coercions).
<!--In the future, coerce_inner will be recursively extended to tuples and
structs. In addition, coercions from sub-traits to super-traits will be
