Fix the filed name in showSaveFilePicker options

[garsue]

Now types is the correct field name, not accepts.
https://developer.mozilla.org/en-US/docs/Web/API/Window/showSaveFilePicker#parameters

[jimmywarting]

d.ts is generated by the JSDocs.
so that should be changed instead.

[garsue]

After fixing JSDoc, I ran npm run _prepublishOnly and re-generated the d.ts.
As a result, unrelated files were also changed, but I committed them as well.

[jimmywarting]

Thanks, that's fine

[linonetwo]

I think showOpenFilePicker also needs to be changed #57 (comment)

And this seems not released in v3.0.0