Adjust wording of 'Using derive' link

Author: dtolnay

README.md

@@ -196,8 +196,10 @@ autocomplete field names to prevent typos, which was impossible in the
 when we write `p.phones[0]`, then `p.phones` is guaranteed to be a
 `Vec<String>` so indexing into it makes sense and produces a `String`.
 
-Read [Using derive](https://serde.rs/derive.html)
-for details on setting up `#[derive(Serialize, Deserialize)]` macro.
+The necessary setup for using Serde's derive macros is explained on the *[Using
+derive]* page of the Serde site.
+
+[Using derive]: https://serde.rs/derive.html
 
 ## Constructing JSON values