Audit core::borrow for use of int/uint: use i32 in doc example.

Author: pnkfelix

src/libcore/borrow.rs

@@ -124,7 +124,7 @@ impl<T> ToOwned<T> for T where T: Clone {
 /// ```rust
 /// use std::borrow::Cow;
 ///
-/// fn abs_all(input: &mut Cow<Vec<int>, [int]>) {
+/// fn abs_all(input: &mut Cow<Vec<i32>, [i32]>) {
 ///     for i in 0..input.len() {
 ///         let v = input[i];
 ///         if v < 0 {