closes#412

As discussed inw3c/dpub-aria#42 (comment),doc-example is a dpub variant of thefigure role. This role being the same asfigure but with the opportunity of being exposed as an "example" for its role description, needs to be an allowed role for thefigure element.

createtest case

• HTML validator
• IBM equal access accessibility checker
• axe-core
• ARC toolkit

Expected results:
doc-example is an allowed role for<figure role=doc-example>...<figcaption>...</figcaption>
figure results in a warning as unnecessary for<figure role=figure>...<figcaption>...</figcaption>
no other roles are allowed if afigcaption is a child of afigure element.

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