Issue description

Reference pages that link to Oracle's JavaSE 1.5 pages are now 404.

For a list of the numerous ArrayList features, please read the Java reference description.

URL(s) of affected page(s)

https://processing.org/reference/ArrayList.html

I haven't checked if there are other "javase/1,5.0" URLs in the reference -- if so, I assume that those are broken as well.

Proposed fix

1. move this 5 link (and any others) to Java 6 -- https://docs.oracle.com/javase/6/docs -- like the one used in the HashMap reference page, which still works
2. OR better, make the whole reference consistent and change all Oracle links, both broken and working, to point to javase/8 reference pages. This would match the underlying build.

I won't submit a pull request unless there is a response from core dev(s) on what they want these Oracle Java reference links to do going forward.