Property actions: rewrite Property Actions documentation

[NguyenThuyLan]

📋 Description

• This PR rewrites the Property Actions documentation:

• Clearer introduction with beginner-friendly context.

• Step-by-step structure (concept → UI → registration → implementation).

• Improved code example with a practical use case.

📎 Related Issues (if applicable)

#7452

✅ 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)

Deadline (if relevant)

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[github-actions]

The Link Checker found broken links in your PR.
Please review the following list:

Broken links found in: 16/umbraco-cms/customizing/property-editors/property-actions.md

⚓ Anchor not found → 16/.gitbook/assets/property-actions-blocklist.png | Cannot find fileFull Github Actions output

[AndyButland]

Looks good to me @LanThuyNguyen. I've left a few inline comments for you to consider and see what you think.

[AndyButland]

Looks good to me now @NguyenThuyLan. Thanks. I'll leave this for @eshanrnh to do a final check and merge.