Notice this commit updates lists.docx. The old test file contained
references to "ListParagraph" style, which should never leak
outside of pandoc, so I'm not sure what that was supposed to test
for exactly.
Previously we had only read the first child of an sdtContents tag. Now
we replace sdt with all children of the sdtContents tag.
This changes the expected test result of our nested_anchors test,
since now we read docx's generated TOCs.
