move snippet to separate files for csharp and vb

[syrotkin]

Summary

Move the SemaphoreSlim code snippet to separate snippet files for C# and VB.NET

No issue has been created for this.

[dnfadmin]

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[opbld32]

Docs Build status updates of commit 9ae5c8e:

✅ Validation status: passed

File	Status	Preview URL	Details
snippets/csharp/System.Threading/SemaphoreSlim/Overview/waitRelease.cs	✅Succeeded	View
snippets/visualbasic/VS_Snippets_CLR_System/system.threading.semaphoreslim/vb/waitRelease.vb	✅Succeeded	View
xml/System.Threading/SemaphoreSlim.xml	✅Succeeded	View

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Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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[gewarren]

Thanks! Can you also add a simple .NET 6 project file for the VB example?

[gewarren]

Suggested change

	SemaphoreSlim.Wait()
	SemaphoreSlim.Wait();

[gewarren]

Suggested change

	SemaphoreSlim.Release()
	SemaphoreSlim.Release();