Add documentation for new workspace unique condition.

[engijlr]

📋 Description

Adds documentation for the new Umb.Condition.WorkspaceContentTypeUnique condition to the Built-in Conditions Types list. This condition allows workspace extensions to be conditionally shown based on a content type's GUID/unique identifier

✅ Contributor Checklist

I've followed the Umbraco Documentation Style Guide and can confirm that:

• Code blocks are correctly formatted.
• Sentences are short and clear (preferably under 25 words).
• Passive voice and first-person language (“we”, “I”) are avoided.
• Relevant pages are linked.
• All links work and point to the correct resources.
• Screenshots or diagrams are included if useful.
• Any code examples or instructions have been tested.
• Typos, broken links, and broken images are fixed.

Deadline (if relevant)

To be published with Umbraco CMS 17.1 release.

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[eshanrnh]

Thanks @engijlr for the PR 🙌 We will review it soon

[eshanrnh]

@engijlr Did you intend to update the article for version 17 located at: 17/umbraco-cms/customizing/extending-overview/extension-types/condition.md?

[engijlr]

Hey @eshanrnh
Sorry for the late reply. I just realized I updated the file in the 15 folder, but yes, I want it to be updated in 17. I’ve reverted the changes and updated it in the correct place.

[eshanrnh]

Everything looks great, @engijlr! 🙌 I made a few minor adjustments to the grammar for clarity.