[Vala] VAPI documentation

[Noah Gibbs <noah_gibbs yahoo com>]

  Is there a good source of VAPI documentation anywhere?  I'm looking at the Poppler tutorial, but it looks 
like that requires the library being wrapped to export itself via pkg-config, and the library I'm looking at 
doesn't do that.

  I've found some example VAPIs from various other libraries, I was just hoping there was also some VAPI 
documentation for the options I find less obvious :-)