fix from engineering review

Co-authored-by: Steven Ryland <[email protected]>

Author: flang-msft

articles/azure-cache-for-redis/cache-management-faq.yml

@@ -146,7 +146,7 @@ sections:
             If you ae using .NET Core, you would set it in `Program.cs`, just before the call to `WebApplication.CreateBuilder()`:
 
               ```csharp
-              private readonly int minThreads = 200
+              const int minThreads = 200
                             
               ThreadPool.SetMinThreads(minThreads, minThreads);