GDPval dataset Word docs corrupted

The [openai/gdpval](https://huggingface.co/datasets/openai/gdpval) dataset on Hugging Face contains Word .docx files with two types of corruption that cause Microsoft Word to display an "unreadable content" error.

### Root Causes

1. **Corrupted settings.xml**: The `word/settings.xml` file uses incorrect namespace prefixes (`ns0:`, `ns1:`, etc.) instead of the proper prefixes (`w:`, `mc:`, `m:`, etc.)

2. **Malformed TargetMode attributes**: Some files have `TargetMode="External"` attributes missing their closing `/>` tag in hyperlink relationships

Both issues cause Word to reject the files even though the XML structure is technically valid.

I have a fix for the issue here https://github.com/alexheat/gdpval-docx-fix