Synthetics DescribeRuntimeVersions command MaxResults maximum is invalid

Question

As per the [documentation for `Synthetics:DescribeRuntimeVersions`](https://docs.aws.amazon.com/AmazonSynthetics/latest/APIReference/API_DescribeRuntimeVersions.html#API_DescribeRuntimeVersions_RequestBody), the maximum value for the `MaxResults` property should be 100. However, the actually implemented maximum `MaxValue` is 80. This happens both with the AWS JS SDK v3 and the AWS CLI v2:

```sh
$ aws synthetics describe-runtime-versions --max-results 81
An error occurred (ValidationException) when calling the DescribeRuntimeVersions operation: Invalid MaxResults
$ aws synthetics describe-runtime-versions --max-results 80 | jq '.RuntimeVersions | length'
30
```

There is either an issue with the documentation, or its implementation

Answer

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Synthetics DescribeRuntimeVersions command MaxResults maximum is invalid

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