Improve example in slice::windows() doc

Now using a window of 3 instead 2 because it removes any
confusion about exactly how consecutive windows overlap

library/core/src/slice/mod.rs

@@ -1045,11 +1045,11 @@ impl<T> [T] {
  /// # Examples
  ///
  /// ```
- /// let slice = ['r', 'u', 's', 't'];
- /// let mut iter = slice.windows(2);
- /// assert_eq!(iter.next().unwrap(), &['r', 'u']);
- /// assert_eq!(iter.next().unwrap(), &['u', 's']);
- /// assert_eq!(iter.next().unwrap(), &['s', 't']);
+ /// let slice = ['l', 'o', 'r', 'e', 'm'];
+ /// let mut iter = slice.windows(3);
+ /// assert_eq!(iter.next().unwrap(), &['l', 'o', 'r']);
+ /// assert_eq!(iter.next().unwrap(), &['o', 'r', 'e']);
+ /// assert_eq!(iter.next().unwrap(), &['r', 'e', 'm']);
  /// assert!(iter.next().is_none());
  /// ```
  ///