fix doc tests (#431)

* fix doc tests

Signed-off-by: Yoshua Wuyts <yoshuawuyts@gmail.com>

* cargo fmt

Signed-off-by: Yoshua Wuyts <yoshuawuyts@gmail.com>

src/stream/stream/min.rs

@@ -1,5 +1,5 @@
+use std::cmp::{Ord, Ordering};
 use std::marker::PhantomData;
-use std::cmp::{Ordering, Ord};
 use std::pin::Pin;
 
 use pin_project_lite::pin_project;

src/stream/stream/mod.rs

@@ -774,11 +774,10 @@ extension_trait! {
 
             # Examples
 
-            ```
+            ```ignore
             # fn main() { async_std::task::block_on(async {
             #
             use std::collections::VecDeque;
-
             use async_std::prelude::*;
 
             let s: VecDeque<usize> = vec![1, 2, 3].into_iter().collect();