I also wanted to point out that the "POD" name on the link in the problem editor has been that way for as long as I have known WeBWorK. Also, for all of the links in the problem editor, if you move your mouse over them, a tooltip displays that shows a longer description of what the links are for. For the "POD" link it says "Documentation from source code for PG modules and macro files." So the information is there for those that look. At the beginning I used those links quite a bit. I still use the POD link frequently to look things up.
I think the real problem is that there was a period where several of those links were broken for a while, and as a result many started to ignore them. Also, much of the documentation in the macro and module files was not very good. We have worked to improve the documentation quite a bit recently.