Clear up some array usage

[schveiguy]

see https://forum.dlang.org/post/ivjnopgnimqedmsnxpeo@forum.dlang.org

[schveiguy]

Don't pull yet, just realized that the text is still incorrect

[schveiguy]

OK, should be good now.

[schveiguy]

Wait, s = a actually compiles.

Don't pull yet. I need to figure out what that line was actually supposed to be doing.

[schveiguy]

So that line was there from the beginning. I think it was an error, or it may not have worked in the early days.

However, it now works, and does something completely different than what the section is talking about -- copying the elements.

I also removed the superfluous explanation that copying a pointer copies it.