changes ref of section element without name from 'no corresponding role' to role=generic.
other changes made in this PR:
remove duplicate instances of code elements from ARIA roles (mostly instances of role=generic).
clarification for section element allowed roles - role=region not recommended in general, not just if the element is named since using the role w/out naming would be useless. mention authors SHOULD NOT use role=generic on the element, per the change from no corresponding role.
closes #474
changes ref of section element without name from 'no corresponding role' to
role=generic.other changes made in this PR:
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