[Scheme] Try to simplify Scheme::Parser::parse. Add POD stating what kind of tree structure is returned.
[Scheme]
Try to simplify Scheme::Parser::parse.
Add POD stating what kind of tree structure is returned.


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@22078 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot