Updated cl-markdown patch to use metabang-bind as documented.
[metabang-bind](https://common-lisp.net/project/metabang-bind/user-guide.html#header3-21) supports the use of `_` as placeholder in binding list for variables which you want ignored. `nil` is also supposed to work, but appears not to in some cases. So this patch changes the use from `nil` to `_`.
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