docs: usage of organization parameter in native self-service flows

[Sese-Schneider]

Improve the docs to document the usage of the organization parameter in native self-service flows.

No code changes are required, as the parameter is processed in hooks which already handle it.

Potentially resolves #4175.
Please let me know if additional work is needed to also update the auto-generated SDKs or the response in the API documentation.

Related issue(s)

• organization parameter for self-service native flow endpoints in SDKs and docs #4175

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
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  contributing code guidelines.
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• I confirm that this pull request does not address a security
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• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[CLAassistant]

All committers have signed the CLA.

[Sese-Schneider]

@aeneasr thank you for merging this PR!
When do you expect this change to be available in the SDKs?
This is currently blocking us from moving forward with integrating Enterprise SSO for our product.