Update example.vb (#1147)

Convert commented-out code from C# to VB syntax. I reported this via issue dotnet/dotnet-api-docs#2944

Author: ericmutta

snippets/visualbasic/VS_Snippets_CLR_System/system.lazy`1/vb/example.vb

@@ -22,9 +22,9 @@ Friend Class Program
 
         ' The following lines show how to use other constructors to achieve exactly the
         ' same result as the previous line: 
-        'lazyLargeObject = new Lazy<LargeObject>(InitLargeObject, true);
-        'lazyLargeObject = new Lazy<LargeObject>(InitLargeObject, _
-        '                               LazyThreadSafetyMode.ExecutionAndPublication);
+        'lazyLargeObject = New Lazy(Of LargeObject)(AddressOf InitLargeObject, True)
+        'lazyLargeObject = New Lazy(Of LargeObject)(AddressOf InitLargeObject, _
+        '                               LazyThreadSafetyMode.ExecutionAndPublication)
         '</SnippetNewLazy>