Fix loop counter and add project files

[gewarren]

Fixes #10809

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-runtime

[learn-build-service-prod]

Learn Build status updates of commit 45c2adf:

✅ Validation status: passed

File	Status	Preview URL	Details
snippets/csharp/System/Array/Clear/clearstruct1.cs	✅Succeeded	View
snippets/csharp/System/Array/Clear/example.cs	✅Succeeded	View
snippets/csharp/System/Array/Clear/Program.cs	✅Succeeded
snippets/csharp/System/Array/Clear/Project.csproj	✅Succeeded
snippets/fsharp/VS_Snippets_CLR_System/system.Array.Clear/fs/example.fs	✅Succeeded	View
snippets/visualbasic/VS_Snippets_CLR_System/system.Array.Clear/vb/clearstruct1.vb	✅Succeeded	View
snippets/visualbasic/VS_Snippets_CLR_System/system.Array.Clear/vb/example.vb	✅Succeeded	View
snippets/visualbasic/VS_Snippets_CLR_System/system.Array.Clear/vb/Program.vb	✅Succeeded
snippets/visualbasic/VS_Snippets_CLR_System/system.Array.Clear/vb/Project.vbproj	✅Succeeded
xml/System/Array.xml	✅Succeeded	View

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[BillWagner]

This LGTM @gewarren

You can when ready.