doc: template metafunctions now work in "syntax" expressions
As noted by @lexi-lambda: https://github.com/racket/racket/issues/2080#issuecomment-389545625
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@ -306,8 +306,8 @@ Equivalent to @racket[~?] and @racket[~@], respectively.
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(define-template-metafunction (metafunction-id . formals) body ...+)]]{
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Defines @racket[metafunction-id] as a @deftech{template
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metafunction}. A metafunction application in a @racket[template]
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expression (but not a @racket[syntax] expression) is evaluated by
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metafunction}. A metafunction application in a @racket[syntax]
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or @racket[template] expression is evaluated by
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applying the metafunction to the result of processing the ``argument''
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part of the template.
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