[FERN-SCRIBE] Add docs about validation in the Fern Definition updated #268
Description
📝 What do you want Fern Scribe (AI Technical Writer) to do?
Add info about validation in the Fern Definition
🔗 Link to existing Slack thread
https://buildwithfern.slack.com/archives/C06N8147J4W/p1750374966649439
📋 Do you know of any documentation that needs to be updated?
No response
❌ If yes, describe why that documentation is incorrect
No response
📰 Changelog Update Required
- Yes, include changelog entry
- No changelog needed
📎 Additional Context
No response