[w3c/uievents-key] use uppercase hex for code points (PR #61)

Closes #60 

The following tasks have been completed:
Editorial

Implementation commitment:

Editorial


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

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Mar 27, 2023, 2:11 PM UTC)_.

<details>
<summary>More</summary>


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%2Fsiusin%2Fuievents-key%2Ff1d062794a6e52e95dd4918b4a54c9d3a01f059c%2Findex.html%3FisPreview%3Dtrue)

```
🕵️‍♀️  That doesn't seem to be a ReSpec document. Please check manually: https://labs.w3.org/spec-generator/uploads/6XhZNN/index.html?isPreview=true%3FisPreview%3Dtrue&publishDate=2023-03-27
```

_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/uievents-key%2361.)._
</details>

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/uievents-key/pull/61

-- Commit Summary --

  * use uppercase hex for code points

-- File Changes --

    M index-source.txt (12)
    M index.html (322)

-- Patch Links --

https://github.com/w3c/uievents-key/pull/61.patch
https://github.com/w3c/uievents-key/pull/61.diff

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