chore: updating table docs with file extensions (#1702)
gh issue: https://github.com/Unstructured-IO/unstructured/issues/1691
Adding filetype extensions from this
[list](https://github.com/Unstructured-IO/unstructured/blob/f98d5e65ca34216e81be9954e7c6429f300e86ad/unstructured/file_utils/filetype.py#L154-L200)
where applicable.
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Co-authored-by: cragwolfe <crag@unstructured.io>
Co-authored-by: Crag Wolfe <crag@unstructuredai.io>
