Update custom-claims-provider-reference.md

[martin-rublik]

Fixing the comment, in the schema the id value represents user's objectid.

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[ShannonLeavitt]

@cilwerner

Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
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[cilwerner]

#sign-off