docs: remove of deprecated property 'developmentOnly'

[douglasdnzcarvalho]

🔗 Linked issue

❓ Type of change

• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [x] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

The developmentOnly property is deprecated, but was being used in the Customizing seeder order section.

📝 Checklist

• [ ] I have linked an issue or discussion.
• [x] I have updated the documentation accordingly.

[RomainLanz]

Thanks!