NAP: Update NMS references to NIM

[aknot242]

Describe the bug

The following pages should be updated to change NMS (NGINX Management Suite) references to NIM (NGINX Instance Manager).

https://docs.nginx.com/nginx-app-protect-waf/v4/admin-guide/install-nms/
https://docs.nginx.com/nginx-app-protect-waf/v5/admin-guide/upgrade-nap-waf/

NOTE: The first link has NMS in the URL itself, so could be a breaking change if there are other pages that link to it.

There may be other pages in NAP with NMS references, so probably worth a search of the docs accompanying the work on this issue.

Thanks!

To reproduce

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[mjang]

cc @ADubhlaoich While this "looks" simple, I thought I heard you talk about some IA changes in work

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