doc: Remove the obsolete comment

[mathieu-clnk]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
doc: Remove the obsolete comment to avoid confusing the user into thinking that workload identity is not supported by the AKS-managed Blob CSI driver.

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[linux-foundation-easycla]

• ✅login: mathieu-clnk / (1d4af7d)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

Welcome @mathieu-clnk!

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[k8s-ci-robot]

Hi @mathieu-clnk. Thanks for your PR.

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[andyzhangx]

@mathieu-clnk thanks for the PR, can you sign the cla?

[andyzhangx]

/ok-to-test
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, mathieu-clnk

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