docs: link-surveys: hidden fields page

[ShubhamPalriwala]

What does this PR do?

Fixes # (issue)

How should this be tested?

• Test A
• Test B

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

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! 🙏

[mattinannt]

@ShubhamPalriwala thank you for adding the docs page 😊💪
I like that it's short and with good examples. I think we should also add that the user must enable hidden fields in the survey editor and add the id of the field that should be available as a hidden field.
Also some screenshots for this process editor and the final response in the response card would be great 😊

[mattinannt]

@ShubhamPalriwala thanks a lot for making the changes 😊
I'm very happy to see the screenshots with the correct font 😅🚀🔥