Bring haddock heading onto one line.

Haddock [does not render](http://hackage.haskell.org/packages/archive/GLUtil/0.7/doc/html/Graphics-GLUtil-ShaderProgram.html) the second line of this header.

The [docs](http://www.haskell.org/haddock/doc/html/ch03s04.html) make no mention of what should happen with multi-line headers.