Fixes Issue #7631

[eshanrnh]

📋 Description

• Updated Manifest with empty element section to clarify guidance on using it.
• Removed Entry Points section as it is covered in other articles on how to register it.
• Updated v15 article to match v16+ article.

📎 Related Issues (if applicable)

Fixes #7631

✅ 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)

CMS v15, 16 and 17

Deadline (if relevant)

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[nielslyngsoe]

HI @eshanrnh looks good :-)