Fix: ILogger in code example

Author: jaliyaudagedara

articles/azure-functions/durable/durable-functions-dotnet-isolated-overview.md

@@ -61,7 +61,7 @@ public class MyActivity : TaskActivity<string, string>
 {
     private readonly ILogger logger;
 
-    public MyActivity(ILogger<SayHelloTyped> logger) // activites have access to DI.
+    public MyActivity(ILogger<MyActivity> logger) // activites have access to DI.
     {
         this.logger = logger;
     }