[w3c/uievents-key] Typo fixes. (PR #67)

A couple of minor typo fixes.

No implementation work or tests needed.


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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 Aug 13, 2023, 3:40 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%2Fw3c%2Fuievents-key%2Fd16781e35f6944bbd56f10003c42d3d0fac282d2%2Findex.html%3FisPreview%3Dtrue)

```
🕵️‍♀️  That doesn't seem to be a ReSpec document. Please check manually: https://labs.w3.org/spec-generator/uploads/FSjHks/index.html?isPreview=true%3FisPreview%3Dtrue&publishDate=2023-08-13
```

_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%2367.)._
</details>

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

  https://github.com/w3c/uievents-key/pull/67

-- Commit Summary --

  * Typo fixes.

-- File Changes --

    M index-source.txt (6)
    M index.html (7)

-- Patch Links --

https://github.com/w3c/uievents-key/pull/67.patch
https://github.com/w3c/uievents-key/pull/67.diff

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