[racket] Аdd support for own language in the scribble

From: Бомбин Валентин (wwall at yandex.ru)
Date: Mon Nov 24 09:08:03 EST 2014

Good day.
How can I add support for your own language in the scribble. For example, for visual basic. Maybe there is some documentation other than "@ Reader Internals"

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