Make table caption a sibling of the table tag

[pcraig3]

The table caption tag needs to be moved up to a sibling of the Table tag

before	after
Caption element inside table	No caption element, just a paragraph before the table

Note: not clear that this is 100% what we should do.

The HTML <caption> should always be the first child of a table: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/caption

Similarly, it seems like there is guidance out there that <Caption> should be the first child of a <Table> in a PDF: https://community.adobe.com/t5/acrobat-discussions/lt-caption-gt-and-lt-table-gt-tag/m-p/9907424