docs: Event listener doc

[Dhruwang]

What does this PR do?

Docs for formbricksSurveyCompleted message event

How should this be tested?

Check link survey docs

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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[github-actions]

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

[jobenjada]

Looks good! :) It's missing a few images and going forward it would be cool to have videos instead of lots of images (easy to record, handle and watch).

I added one but there is an issue with loading it in the Docs app.

Please make it work and consult with @ShubhamPalriwala if you have doubts, he set up the docs app :)

[ShubhamPalriwala]

LGTM ✅