N1C -- XC-based link update

[mjang]

Proposed changes

Follow-up to #248

• Left out a link that doesn't work (yet)

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[kamalchaturvedi]

These existing roles will be updated in production as a part of XC ATOM release. Recommend keeping this MR open until that change has been made.

[mjang]

The roles exist, the link should work soon, probably at https://docs.cloud.f5.com/docs-v2/administration/how-tos/user-mgmt/rbac

[mjang]

These existing roles will be updated in production as a part of XC ATOM release. Recommend keeping this MR open until that change has been made.

@kamalchaturvedi

The broken link is getting attention. I may push this (and set up a second PR once the XC ATOM release is available)