Hostname pre-validation updates

[pijemcolu]

Updating the hostname page

📋 Description

• region updates
• a record updates
• mentioning hostname pre-validation when necessary
• clarifying custom proxy/waf use cases

📎 Related Issues (if applicable)

✅ 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 Cloud

Deadline (if relevant)

N/A

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[eshanrnh]

Thanks for the PR, @pijemcolu 🙌 I have added a few suggestions to fix formatting and vale errors, which I'll take care of.

There's an incomplete sentence. Can you fix that?