[Documentation] Update the Identity Access Management documentation to include how to receive credentials

[msschroeder]

Describe the feature request.
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Update the Identity Access management documentation to include addition information on how to receive credentials (also related to FHIR REST API.

Additional context
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Related documentation:
Identity Access management

Possibly related:
FHIR REST API

Acceptance criteria
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Documentation is complete

Area path
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N/A

Implementation plan (For Engineers)
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