Ch. 13: unwrap_or_else takes all three kinds of closures

src/ch13-01-closures.md

@@ -329,13 +329,13 @@ Using `FnOnce` in the trait bound expresses the constraint that
 `unwrap_or_else` is only going to call `f` at most one time. In the body of
 `unwrap_or_else`, we can see that if the `Option` is `Some`, `f` won’t be
 called. If the `Option` is `None`, `f` will be called once. Because all
-closures implement `FnOnce`, `unwrap_or_else` accepts all closures and is as
-flexible as it can be.
+closures implement `FnOnce`, `unwrap_or_else` accepts all three kinds of
+closures and is as flexible as it can be.
 
 > Note: Functions can implement all three of the `Fn` traits too. If what we
 > want to do doesn’t require capturing a value from the environment, we can use
 > the name of a function rather than a closure where we need something that
-> implements one of the `Fn` traits. For example, on an `Option<Vec<T>>` value
+> implements one of the `Fn` traits. For example, on an `Option<Vec<T>>` value,
 > we could call `unwrap_or_else(Vec::new)` to get a new, empty vector if the
 > value is `None`.