chore(tidy): reformat index.html

[github-actions[bot]]

Automated change.

index.html reformatted with tidy -config tidyrc -modify index.html.

---

:boom: Error: 500 Internal Server Error :boom:

PR Preview failed to build. (Last tried on Jan 5, 2024, 11:18 AM UTC).

More

PR Preview relies on a number of web services to run. There seems to be an issue with the following one: :rotating_light: [Spec Generator](https://www.w3.org/2015/labs/) - Spec Generator is the web service used to build specs that rely on ReSpec. :link: [Related URL](https://labs.w3.org/spec-generator/?type=respec&url=https%3A%2F%2Fraw.githubusercontent.com%2Fw3c%2Fbattery%2F1b1f1bb63be9cc827d8e67a4fa137a6597c39243%2Findex.html%3FisPreview%3Dtrue) ``` 😭 Sorry, there was an error generating the HTML. Please report this issue! Specification: http://labs.w3.org/spec-generator/uploads/qltucn/index.html?isPreview=true%3FisPreview%3Dtrue&publishDate=2024-01-05 ReSpec version: 34.3.0 File a bug: https://github.com/w3c/respec/ Error: undefined ``` _If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](https://github.com/tobie/pr-preview/issues/new?title=Error%20not%20surfaced%20properly&body=See%20w3c/battery%2362.)._

[rakuco]

@anssiko is it OK for me to mark this PR as non-substantive to make the IPR check pass?

[anssiko]

Please go ahead.

[w3cbot]

rakuco marked as non substantive for IPR from ash-nazg.