Use slice syntax instead of slice_to, etc.

Author: nrc

lib.rs

@@ -230,7 +230,7 @@ pub trait Rng {
     /// let choices = [1i, 2, 4, 8, 16, 32];
     /// let mut rng = task_rng();
     /// println!("{}", rng.choose(choices));
-    /// assert_eq!(rng.choose(choices.slice_to(0)), None);
+    /// assert_eq!(rng.choose(choices[..0]), None);
     /// ```
     fn choose<'a, T>(&mut self, values: &'a [T]) -> Option<&'a T> {
         if values.is_empty() {