Fix Snippets 5000 error by renaming Example class to ThreadSleepExample

Co-authored-by: gewarren <[email protected]>

Author: Copilot

snippets/visualbasic/System.Threading/Thread/Sleep/example.vb

@@ -1,7 +1,7 @@
 '<Snippet1>
 Imports System.Threading
 
-Class Example
+Class ThreadSleepExample
 
     Shared Sub Main()