docs: Update useSWR return value descriptions

[minsoo-web]

Description

I Update return value description in Index page

I think this example using data, isLoading and error. However, isLoading is missing from the description.

So I add isLoading in en-US and ko.

Questions

As far as I know, the useSWR has other return values except for data, isLoading, and error, but the description says that only 2 values are returned.

How about hanging the read more link for the other return values??

• [ ] Adding new page
• [x] Updating existing documentation
• [ ] Other updates

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[huozhi]

Thanks!