[racket] scribbling a stand-alone scribble/lp file

It also appears that one cannot scribble a stand-alone scribble/lp
file: it produces

dynamic-require: name is not provided
  name: 'doc
...

(This, for instance, is scribbling the very example in
http://docs.racket-lang.org/scribble/lp.html .)  But scribbling the
wrapper seems to work fine.

If true this might be useful to mention in the documentation, because
it's a bit of an obstacle to getting started with the LP system (the
example there *looks* like a complete document that one ought to be
able to Scribble!).

Shriram