fix: add Cmder annotation

[rfyiamcool]

summary

Every time I call this methods, I need to test the output, I have added some samples of the output here. Next time I look at the code comments, I'll know how to use these methods. 😁

e.g. by printing the data, I knew the difference of the methods in Cmder.

...

func (redisHook) ProcessHook(hook redis.ProcessHook) redis.ProcessHook {
	return func(ctx context.Context, cmd redis.Cmder) error {
		fmt.Printf("starting processing: <%s>\n", cmd)
		err := hook(ctx, cmd)
		fmt.Printf("finished processing: <%s>\n", cmd)

		fmt.Printf("--- %+v \n", cmd.FullName())
		fmt.Printf("--- %+v \n", cmd.Args())
		fmt.Printf("--- %+v \n", cmd.Name())
		fmt.Printf("--- %+v \n", cmd.String())
		fmt.Printf("--- %+v \n", cmd.Err())

		return err
	}
}

...