Update documentation describing CloudWatch put_metric_alarm behavior for create vs update operations

[mullermp]

Aws::CloudWatch::Client#put_metric_alarm supports a tags field, but it only works when the alarm does not already exist. The tags field is ignored when updating the alarm.

To update tags on an existing alarm, Aws::CloudWatch::Client#tag_resource and Aws::CloudWatch::Client#untag_resource are required

The documentation should be updated to reflect that tags are not updated when the alarm already exists.

related: aws/aws-sdk-ruby#2408

[mullermp]

@kellertk I don't have permission to assign labels, I'm sure that's intended. But please categorize this as documentation improvement.

[ajredniwja]

Changes were made, see: https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_PutMetricAlarm.html

Closing this issue now, please reach out if you have any other questions.

[github-actions]

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