Nit: Remove leading whitespace

Author: anirudhb

src/libcore/slice/mod.rs

@@ -1541,7 +1541,7 @@ 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 
+    /// // 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,
     /// // to two, the same size as the destination slice. It *will* panic if we don't do this.
     /// dst.clone_from_slice(&src[2..]);
@@ -1610,7 +1610,7 @@ 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 
+    /// // 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,
     /// // to two, the same size as the destination slice. It *will* panic if we don't do this.
     /// dst.copy_from_slice(&src[2..]);