fix: allow 'doc-dedication' role on 'aside' elements

Related HTML checker PR:
validator/validator#988

Author: mattgarrish

src/main/resources/com/adobe/epubcheck/schema/30/mod/html5/structural.rnc

@@ -116,6 +116,7 @@
 			|	common.attrs.aria.role.feed
 			|	common.attrs.aria.role.region
 			|	common.attrs.aria.role.presentation
+			|	common.attrs.aria.role.doc-dedication
 			|	common.attrs.aria.role.doc-example
 			|	common.attrs.aria.role.doc-footnote
 			|	common.attrs.aria.role.doc-pullquote