Idea to allow people to comment on Haskell docs

[Simon Peyton-Jones]

| They will get the right anchor if people follow the convention of
using
| headings for each function they want to add notes about. In the wiki
| markup that means writing:
| 
| = withSvgFromFile =

Aha.  It'd be good if the text they see when they are about to start
editing a blank comment file gave them exactly this advice.  Don't know
if that is possible, but that's the moment they'll need it!

Simon