fix: (docs) mention google drive api for sheets integration in self host

[ShubhamPalriwala]

What does this PR do?

Thanks to our community member, mforsetti 🥳, for pointing out that we missed an important point of enabling the Drive API for the Google Sheets integration to work. This PR adds the point.

Checklist

Required

• Filled out the "How to test" section in this PR
• Read How we Code at Formbricks
• Self-reviewed my own code
• Commented on my code in hard-to-understand bits
• Ran pnpm build
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues
• First PR at Formbricks? Please sign the CLA! Without it we wont be able to merge it 🙏

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR
• Updated the Formbricks Docs if changes were necessary

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2 Ignored Deployments

Name	Status	Preview	Updated (UTC)
formbricks-cloud	⬜️ Ignored (Inspect)		Jan 16, 2024 11:11am
formbricks-com	⬜️ Ignored (Inspect)		Jan 16, 2024 11:11am

[github-actions]

Thank you for following the naming conventions for pull request titles! 🙏

[mattinannt]

@ShubhamPalriwala thank you for the quick turnaround 💪