fix(localization): improve Finnish language (fi-Fi) screen reader localizations for combobox

[joonaojapalo]

Closes

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue. Not applcable. I considered not worth opening an issue for tiny linguistic improvement.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests). Not applicable. Integrity of JSON already being tested by static imports and useLocalizedStringFormatter in useCombobox.
• Filled out test instructions.
• Updated documentation (if it already exists for this component). Not applicable.
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

Run storybook in related feature branch:

1. Set browser language to Finnish
2. Navigate to combobox's story with a screen reader
3. Type into combobox's input a string which results multiple options available
4. Verify that screen reader reads "X vaihtoehtoa saatavilla" (instead of current "X vaihtoehdot saatavilla")

[snowystinger]

Thanks for the PR, I opened a ticket with our translators for verification and alignment across Adobe. I'll update here when I learn more. Sometimes it can take a bit of time, but I haven't forgotten about your PR.