fix case of userAssignedIdentityID field

[femnad]

Description

Minor documentation fix to ensure that all references to the userAssignedIdentityID field are correct.

Checklist

• Unit tests updated
• End user documentation updated

[k8s-ci-robot]

Hi @femnad. Thanks for your PR.

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[mloiseleur]

thansk @femnad
/ok-to-test
/lgtm

[szuecs]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: szuecs

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