Update SCIM provisioning requirements in documentation

[lorenyeung]

Clarified requirements for API key and permissions needed for SCIM provisioning in Harness.

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Please check the Execution Link of the Pipeline for the Website Draft URL. This is located in the Preview Step behind the Harness VPN and also is available in #hdh_alerts. E.g Website Draft URL: https://unique-id--harness-developer.netlify.app. Current Draft URL is: https://69afa236c37776873f86bbd4--harness-developer.netlify.app