Item 25: §19.2.3.2 Add angle brackets

Change `` `Sᵢ,... Aₑ` `` to `` `S<Aᵢ,... Aₑ>` `` to match the input-unsafe definition format.

Author: BillWagner

standard/interfaces.md

@@ -100,7 +100,7 @@ A type T is ***output-unsafe*** if one of the following holds:
 
 - `T` is a contravariant type parameter
 - `T` is an array type with an output-unsafe element type
-- `T` is an interface or delegate type `Sᵢ,... Aₑ` constructed from a generic type `S<Xᵢ, ... Xₑ>` where for at least one `Aᵢ` one of the following holds:
+- `T` is an interface or delegate type `S<Aᵢ,... Aₑ>` constructed from a generic type `S<Xᵢ, ... Xₑ>` where for at least one `Aᵢ` one of the following holds:
   - `Xᵢ` is covariant or invariant and `Aᵢ` is output-unsafe.
   - `Xᵢ` is contravariant or invariant and `Aᵢ` is input-unsafe.