Reformat routing-properties.md

[OwainWilliams]

📋 Description

A small change to the formatting of the document. The line break was in a strange place and it broke up mid sentence.

✅ 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.

[sofietoft]

Thanks for the PR @OwainWilliams !

I took the liberty of cleaning up some grammar and stuff in the sentence as well.
I'll merge it in 🙏