fix: Change ocr_line <span> to include all ocr_word

[ralscha]

Fixes the xml for ocr_line. The span of ocr_line should enclose all spans of ocr_word

[google-cla]

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[holtskinner]

• Please fill out the CLA https://cla.developers.google.com/
• Change the PR message to follow conventionalcommits.org
• Update the tests as needed for your change

[conventional-commit-lint-gcf]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

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[holtskinner]

I updated the test data and fixed the PR message for you.

@ralscha I just need you to fill out the Google Contributor License Agreement (CLA) to get this merged. https://cla.developers.google.com/

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