Add comment to keep implemenatations in sync (#5603)

Author: pragnagopa

src/WebJobs.Script/Host/FunctionMetadataProvider.cs

@@ -188,6 +188,10 @@ internal static string ParseLanguage(string scriptFilePath, IEnumerable<RpcWorke
             return null;
         }
 
+        // Logic for this function is copied to:
+        // https://github.com/projectkudu/kudu/blob/master/Kudu.Core/Functions/FunctionManager.cs
+        // These two implementations must stay in sync!
+
         /// <summary>
         /// Determines which script should be considered the "primary" entry point script. Returns null if Primary script file cannot be determined
         /// </summary>