Mark up MedicalScholarlyArticle abstract as description
Mark up MedicalScholarlyArticle abstract as description

schema:description provides "a short description of an item", while an abstract
provides a short description of an article. Rather than leaving the abstract in
the MedicalScholarlyArticle example without any structure, use
schema:description to mark up the abstract as we do in the example for Article.

Signed-off-by: Dan Scott <2591e5f46f28d303f9dc027d475a5c60d8dea17a@coffeecode.net>

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