Fix doc on `tuple_list_as_map`
Closes
@@ -1352,7 +1352,7 @@ pub mod btreemap_as_tuple_list {
/// #[derive(Deserialize, Serialize)]
/// struct S {
/// #[serde_as(as = "BTreeMap<_, _>")] // HashMap will also work
-/// s: BTreeMap<(String, u32), u32>,
+/// s: Vec<(i32, String)>,
/// }
/// # }
/// ```
