Clarify queueLengthStrategy description in docs for Azure Queue Autoscaling #1642
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I noticed while reviewing the code for this path (https://github.com/kedacore/keda/blob/e89626a16563735b8cc6211fbcbdc43e51d37d15/pkg/scalers/azure_queue_scaler.go), that I had originally misinterpreted how the visibleonly queue length strategy works. This PR tries to clarify the mistaken behavior by making it explicit that the count that has to be 32 or higher before falling back to the regular behavior is that of the visible messages not the queue overall.
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