follow-up to review from Centril

src/subtyping.md

@@ -183,10 +183,10 @@ to trying to explain:
 The types with \*'s are the ones we will be focusing on, as they are in
 some sense "fundamental". All the others can be understood by analogy to the others:
 
-* `Vec` and all other owning pointers and collections follow the same logic as `Box`
+* `Vec<T>` and all other owning pointers and collections follow the same logic as `Box<T>`
-* `Cell` and all other interior mutability types follow the same logic as `UnsafeCell`
+* `Cell<T>` and all other interior mutability types follow the same logic as `UnsafeCell<T>`
-* `*const` follows the logic of `&T`
+* `*const T` follows the logic of `&T`
-* `*mut` follows the logic of `&mut T` (or `UnsafeCell<T>`)
+* `*mut T` follows the logic of `&mut T` (or `UnsafeCell<T>`)
 
 > NOTE: the *only* source of contravariance in the language is the arguments to
 > a function, which is why it really doesn't come up much in practice. Invoking