Update index.md

[MichaelReyesCatcan]

Change of function in export_user_preferences().

get_user_preference -> get_user_preferences()

Unit test failing.

tool_dataprivacy\expired_data_requests_test::test_data_request_expiry
Unexpected debugging() call detected.
Debugging: Call to undefined function mod_xxxxx\privacy\get_user_preference()

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