Fix Cloudwatch documentation suggesting invalid conditions

[nicolajv]

Provide a description of what has been changed

The currently documentation incorrectly assumes the ability to scope down KEDA GetMetricData permissions by the use of conditions. However as shown in the official Actions defined by Amazon CloudWatch documentation, GetMetricData does not support any condition keys.

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[robpickerill]

This is correct, and my mistake, putmetricdata has a condition, not getmetricdata