Content script UI options API reference is hard to follow

Describe the bug

Try to find the docs for the append option here: https://wxt.dev/api/reference/wxt/client/functions/createShadowRootUi.html

You can't lol. Well, you can, but people will give up before finding it.

We could duplicate the JSDoc between the three options, but then they'd get out of sync. Maybe that's worth it for ease of use. Here's where the types are located: https://github.com/wxt-dev/wxt/blob/a38e3c27330ab82f9c136191fc85b9b101516915/packages/wxt/src/client/content-scripts/ui/types.ts

Originally reported here: https://discord.com/channels/1212416027611365476/1296842665249472614/1342135208220299274

Reproduction

https://wxt.dev/api/reference/wxt/client/functions/createShadowRootUi.html

Steps to reproduce

N/A

System Info

N/A

Used Package Manager

npm

Validations

• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
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• The provided reproduction is a minimal reproducible example of the bug.

Start with packages/wxt/src/client/content-scripts/ui/types.ts and compare its option JSDoc with the generated createShadowRootUi API reference at wxt.dev/api/reference/wxt/client/functions/createShadowRootUi.html. Improve the reference so the append option and the other content-script UI options are easy to find, while keeping their documentation maintainable and synchronized.