[w3c/uievents-key] update the reference to UAX15 (PR #62)

Closes #59 

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, 2:25 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%2Fad4c4f730d97bd436b239b0f2f06e0ea50757a00%2Findex.html%3FisPreview%3Dtrue)

```
🕵️‍♀️  That doesn't seem to be a ReSpec document. Please check manually: https://labs.w3.org/spec-generator/uploads/PHfBl8/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%2362.)._
</details>

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

  https://github.com/w3c/uievents-key/pull/62

-- Commit Summary --

  * update the reference to UAX15

-- File Changes --

    M index-source.txt (8)
    M index.html (310)

-- Patch Links --

https://github.com/w3c/uievents-key/pull/62.patch
https://github.com/w3c/uievents-key/pull/62.diff

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