example/features/retry: fix grpc.NewClient call in documentation (#8163)

Author: purnesh42H

examples/features/retry/README.md

@@ -60,5 +60,5 @@ To use the above service config, pass it with `grpc.WithDefaultServiceConfig` to
 `grpc.NewClient`.
 
 ```go
-conn, err := grpc.NewClient(ctx,grpc.WithTransportCredentials(insecure.NewCredentials()), grpc.WithDefaultServiceConfig(retryPolicy))
+conn, err := grpc.NewClient(target, grpc.WithTransportCredentials(insecure.NewCredentials()), grpc.WithDefaultServiceConfig(retryPolicy))
 ```