Add note about `access_level` to the resource

Patrick Ricerequested to merge
add-documentation-note-to-saml-link into main
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This adds some additional documentation around how to use custom roles with the SAML Group Link to hopefully help clear up communication that end users might have.

Related to #6290 (comment 1901211283)

Edited by 🤖 GitLab Bot 🤖

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