OKTA-926630 - Update role assignment concept

[brianduffield-okta]

Description:

• What's changed? Removed static standard role tables from this Concept and referenced the OAS3 site with this content
• Is this PR related to a Monolith release? n/a

Resolves:

• OKTA-926630

[acrolinxdevdocs-okta]

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[eng-info-dev-github-bot]

Netlify Preview URL for the changes: https://preview-5422--reverent-murdock-829d24.netlify.app

[vanngo-okta]

The updates look good to me! 👍

There are 2 other references in this doc that have potentially outdated lists - maybe we can update the content or link it out to the openapi/okta-management/guides/roles file too?

Maybe this is outside of the scope of this ticket? It can be addressed in another task.