Edit comment to specify for reference

[nahuakang]

Fixes #111. Let me know if this is okay :) Cheers!

[ratfactor]

@nahuakang Looks great! It's just a little long. I try to keep the Ziglings columns under 80 for small screens and split screens.

Instead of

        // Loop through every alien by reference by specifying that the capture value is a pointer

Could we shorten it to something like

        // Loop through every alien by reference (* makes a pointer capture value)

Thanks!

[nahuakang]

Done :) Thanks Dave!

[ratfactor]

Perfect, thanks!