fix array definition

en/02.2.md

@@ -295,7 +295,7 @@ Then we define a `slice`, and initialize its data.
 	
 `slice` can redefine existing slices or arrays. `slice` uses `array[i:j]` to slice, where `i` is the start index and `j` is end index, but notice that `array[j]` will not be sliced since the length of the slice is `j-i`.
 
-	// define a slice with 10 elements whose types are bytes
+	// define an array with 10 elements whose types are bytes
 	var ar = [10]byte {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'}
 
 	// define two slices with type []byte