Tiptap RTE updates for v17.0

[leekelleher]

📋 Description

Updates Rich Text Editor > Extensions documentation with the latest changes for Umbraco CMS 17.0.
(These should have been made before v17.0 launch, but fell through the gaps, my fault! 😖)

📎 Related Issues (if applicable)

• Missing @umbraco-cms/backoffice/external/tiptap Module in Umbraco v17 Umbraco-CMS#21079

✅ 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)

Umbraco CMS v17.0

Deadline (if relevant)

As soon as convenient.

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[sofietoft]

LGTM @leekelleher , thanks! 💪

I'll merge it.