Fix sample CEL expression in volumes.md

[DonaldKellett]

Fix sample CEL expression for rejecting gitRepo volumes in volumes.md

Description

Update the sample CEL expression for rejecting gitRepo volumes under docs/concepts/storage/volumes.md from (incorrect):

has(object.spec.volumes) || !object.spec.volumes.exists(v, has(v.gitRepo))

To (correct):

!has(object.spec.volumes) || !object.spec.volumes.exists(v, has(v.gitRepo))

Issue

Fix #48816

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• ✅login: DonaldKellett / (38e7774)

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