because the previous documentation didn't actually define the form;
the examples were good, but epecting a reader to infer meaning
from examples wasn't good enough. The use of a `module-path?' contract
in the old docs wasn't appropriate; contracts apply to values, while
grammar productions should be used to document syntax constraints.
Also, `module-path?' was too permissive (only literal strings and
identifiers are actually allowed), while the actual syntax allows
either a single path or a sequence.
a7ae3b807e
