Remove String.Copy from snippets

[gewarren]

Fixes #9980

(Hide whitespace changes.)

[dotnet-policy-service]

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

[learn-build-service-prod]

Learn Build status updates of commit 3de093f:

✅ Validation status: passed

File	Status	Preview URL	Details
snippets/csharp/System/ActionT1,T2,T3,T4/Overview/Action4.cs	✅Succeeded	View
snippets/csharp/System/ActionT1,T2,T3,T4/Overview/Anon.cs	✅Succeeded	View
snippets/csharp/System/ActionT1,T2,T3,T4/Overview/Delegate.cs	✅Succeeded	View
snippets/csharp/System/ActionT1,T2,T3,T4/Overview/Lambda.cs	✅Succeeded	View
snippets/csharp/System/ActionT1,T2,T3,T4/Overview/Program.cs	✅Succeeded
snippets/csharp/System/ActionT1,T2,T3,T4/Overview/Project.csproj	✅Succeeded
snippets/csharp/System/ActionT1,T2,T3/Overview/Action3.cs	✅Succeeded	View
snippets/csharp/System/ActionT1,T2,T3/Overview/Anon.cs	✅Succeeded	View
snippets/csharp/System/ActionT1,T2,T3/Overview/Delegate.cs	✅Succeeded	View
snippets/csharp/System/ActionT1,T2,T3/Overview/Lambda.cs	✅Succeeded	View
snippets/csharp/System/ActionT1,T2,T3/Overview/Program.cs	✅Succeeded
snippets/csharp/System/ActionT1,T2,T3/Overview/Project.csproj	✅Succeeded
snippets/csharp/System/Object/MemberwiseClone/memberwiseclone1.cs	✅Succeeded	View
snippets/fsharp/System/Object/MemberwiseClone/memberwiseclone1.fs	✅Succeeded	View
snippets/visualbasic/System/Object/MemberwiseClone/memberwiseclone1.vb	✅Succeeded	View
snippets/visualbasic/System/Object/MemberwiseClone/Project.vbproj	✅Succeeded
snippets/visualbasic/VS_Snippets_CLR_System/system.Action~3/vb/Action3.vb	✅Succeeded	View
snippets/visualbasic/VS_Snippets_CLR_System/system.Action~3/vb/Delegate.vb	✅Succeeded	View
snippets/visualbasic/VS_Snippets_CLR_System/system.Action~3/vb/lambda.vb	✅Succeeded	View
snippets/visualbasic/VS_Snippets_CLR_System/system.Action~3/vb/Program.vb	✅Succeeded
snippets/visualbasic/VS_Snippets_CLR_System/system.Action~3/vb/Project.vbproj	✅Succeeded
snippets/visualbasic/VS_Snippets_CLR_System/system.Action~4/vb/Action4.vb	✅Succeeded	View
snippets/visualbasic/VS_Snippets_CLR_System/system.Action~4/vb/Delegate.vb	✅Succeeded	View
snippets/visualbasic/VS_Snippets_CLR_System/system.Action~4/vb/lambda.vb	✅Succeeded	View
snippets/visualbasic/VS_Snippets_CLR_System/system.Action~4/vb/Program.vb	✅Succeeded

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[BillWagner]

This LGTM