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remove outdated comment

The audit resources will also support merging now by default after pairs were removed.

PiperOrigin-RevId: 257601122

GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare,GoogleCloudPlatform/healthcare