Add "or destination" to {copy, clone}_from_slice example

Author: anirudhb

src/libcore/slice/mod.rs

@@ -1541,8 +1541,8 @@ impl<T> [T] {
     /// let src = [1, 2, 3, 4];
     /// let mut dst = [0, 0];
     ///
-    /// // Note: the slices must be the same length, so you can slice the
-    /// // source to be the same size. Here we slice the source, four elements,
+    /// // Note: the slices must be the same length, so you can slice the source
+    /// // or the destination to be the same size. Here we slice the source, four elements,
     /// // to two, the same size as the destination slice. It *will* panic if we don't do this.
     /// dst.clone_from_slice(&src[2..]);
     ///
@@ -1610,8 +1610,8 @@ impl<T> [T] {
     /// let src = [1, 2, 3, 4];
     /// let mut dst = [0, 0];
     ///
-    /// // Note: the slices must be the same length, so you can slice the
-    /// // source to be the same size. Here we slice the source, four elements,
+    /// // Note: the slices must be the same length, so you can slice the source
+    /// // or the destination to be the same size. Here we slice the source, four elements,
     /// // to two, the same size as the destination slice. It *will* panic if we don't do this.
     /// dst.copy_from_slice(&src[2..]);
     ///