This question is about IIS configuration. Nothing about it is related to security.
Yes, you may think that there is a security benefit in hiding the IIS version number. (But I think you're wrong. Hiding the fact that you're running a vulnerable version doesn't make it less vulnerable.) The question “is there a security benefit in hiding the IIS version number?” would be a security question and on-topic here. But this question merely asks how to change the configuration, it's a pure how-to question that isn't about security. It's squarely off-topic here.
Security.SE has a migration path to Super User, but not Server Fault. Server Fault only wants questions from professional system administrators about enterprise hardware and software; if there is any doubt, they don't want the question. In particular, just because the question is about a server doesn't make it on-topic for Server Fault.