Add Forms 13/15/16 RC release notes

[ronaldbarendse]

📋 Description

Add Forms 13.5.0-rc, 15.2.0-rc and 16.0.0-rc, Forms Deploy 13.1.1, 15.1.1 and 16.0.0-rc3 release notes.

✅ 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.

Product & Version (if relevant)

Forms 13.5.0-rc
Forms 15.2.0-rc
Forms 16.0.0-rc
Forms Deploy 13.1.1
Forms Deploy 15.1.1
Forms Deploy 16.0.0-rc3

Deadline (if relevant)

All versions are already available on NuGet, so this can be published asap.

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[eshanrnh]

Looks good to me, @ronaldbarendse 🙌