[saml] Missing documentation for PROVIDERS__SAML__CONFIG__AUDIENCE in the SAML configuration example

[c-neto]

⚠️ Problem:

After updating OpenCTI from 6.0.0 to 6.6.13, I encountered issues with the existing SAML configuration, which had previously worked without problems. While investigating the issue on the OpenCTI Platform, I found the following case: OpenCTI-Platform/opencti#7662. Based on this comment by @Markus98, I added PROVIDERS__SAML__CONFIG__AUDIENCE with the same value as PROVIDERS__SAML__CONFIG__SAML_CALLBACK_URL, which resolved the problem.

The PROVIDERS__SAML__CONFIG__AUDIENCE variable is not mentioned anywhere in the documentation, and I believe it would be valuable to include this information in the examples.

---

📃 Documentation Section:

• https://docs.opencti.io/latest/deployment/authentication/