(synthetics): documentation of canary schedule expression only supports rate

[mprencipe]

According to the CDK reference documentation the Canary schedule expression only supports rate.
https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-synthetics.Schedule.html

According to this documentation the scheduling configuration is much more flexible https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch_Synthetics_Canaries_cron.html

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This is a 📕 documentation issue

[kaizencc]

Currently you can use synthetics.Schedule.expression('cron(0 10 * * ? *)') to specify a cron expression for canaries. The documentation here should reflect that, I agree.

I also think that we should have a static cron method in the schedule class for easier usability though - there are similar methods in autoscaling and application autoscaling.

[kaizencc]

#16402 should have closed this issue

[github-actions]

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