Completed ex005 and added questions into 005_intro.

@manglabs

PR initialized.
Because that's where the array is located? I assumed that I couldn't have two arrays with the same code otherwise they might conflict with one another. I know you're going to say, "Test it and see!" and I also know you hate the word assume (Sleepy memories). I'll get better at that.

The comma was a typo. I'm not QA'ing my shiz good enough. /disappointed