Fix challenge example solution not displayed

[XplosiveRaptor]

Summary

Added a linebreak between the details tag and the code block in. This makes the code block actually display the snippet.

Fixes #47140

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Internal previews

📄 File	🔗 Preview link
docs/csharp/tour-of-csharp/tutorials/branches-and-loops.md	docs/csharp/tour-of-csharp/tutorials/branches-and-loops
docs/csharp/tour-of-csharp/tutorials/hello-world.md	docs/csharp/tour-of-csharp/tutorials/hello-world
docs/csharp/tour-of-csharp/tutorials/list-collection.md	docs/csharp/tour-of-csharp/tutorials/list-collection
docs/csharp/tour-of-csharp/tutorials/numbers-in-csharp.md	docs/csharp/tour-of-csharp/tutorials/numbers-in-csharp

[BillWagner]

Hi @XplosiveRaptor

It looks like this same issue impacts the following intro tutorials:

• Hello World
• Numbers
• Branches and Loops

I've verified that your fix works on the review site. Let me know if you want to change the other three tutorials as well. If not, I'll make a follow up PR after merging this one.

[XplosiveRaptor]

I would be happy to fix those as well! How would I add those changes to this same pull request?

[BillWagner]

I would be happy to fix those as well! How would I add those changes to this same pull request?

@XplosiveRaptor Yes, please add them to the same PR. Thank you.

[XplosiveRaptor]

@dotnet-policy-service agree

[BillWagner]

Thanks @XplosiveRaptor

This LGTM and I'll now.