fix typo in BudgetDetails

[zirain]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

align comment with field name

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @zirain. Thanks for your PR.

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[arkodg]

LGTM thanks

/approve

[robscott]

Thanks @zirain!

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: arkodg, robscott, zirain

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[robscott]

/lgtm

[zirain]

@robscott need cherrypick to v1.3?