Prefer using 'io::Result' responder in docs.

core/lib/src/data/limits.rs

@@ -94,10 +94,9 @@ use crate::http::uncased::Uncased;
 /// use std::io;
 ///
 /// use rocket::data::{Data, Limits, ToByteUnit};
-/// use rocket::response::Debug;
 ///
 /// #[post("/echo", data = "<data>")]
-/// async fn echo(data: Data, limits: &Limits) -> Result<String, Debug<io::Error>> {
+/// async fn echo(data: Data, limits: &Limits) -> io::Result<String> {
 ///     let limit = limits.get("data").unwrap_or(1.mebibytes());
 ///     Ok(data.open(limit).into_string().await?.value)
 /// }

site/guide/3-overview.md

@@ -298,11 +298,11 @@ necessary, you can convert a synchronous operation to an async one with
 ```rust
 # #[macro_use] extern crate rocket;
 use std::io;
+
 use rocket::tokio::task::spawn_blocking;
-use rocket::response::Debug;
 
 #[get("/blocking_task")]
-async fn blocking_task() -> Result<Vec<u8>, Debug<io::Error>> {
+async fn blocking_task() -> io::Result<Vec<u8>> {
     // In a real app, use rocket::fs::NamedFile or tokio::fs::File.
     let vec = spawn_blocking(|| std::fs::read("data.txt")).await
         .map_err(|e| io::Error::new(io::ErrorKind::Interrupted, e))??;