(/aws-batch): Update README to add guidance on Updating AWS Fargate compute environments

[deftcx-aws]

Describe the issue

aws-cdk-lib.aws_batch.FargateComputeEnvironment needs to be updated for Fargate CEs

This doc is not consistent with other docs:

https://docs.aws.amazon.com/batch/latest/userguide/updating-compute-environments.html
https://docs.aws.amazon.com/cli/latest/reference/batch/update-compute-environment.html

Following fields in FargateComputeEnvironmentProps of FargateComputeEnvironment are not applicable. We might not be able to change model now as it is out, we can update documentation to reflect it is not applicable.

All these params are optional ? .

replaceComputeEnvironment?
terminateOnUpdate?
updateTimeout?
updateToLatestImageVersion?

### Links

https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-batch/README.md

[pahud]

Hi

To address the issue, I propose adding a clarification note to the README.md. A suitable location would be near the initial examples or descriptions of FargateComputeEnvironment. Here's the suggested text:

Note: While the FargateComputeEnvironmentProps interface includes properties like replaceComputeEnvironment, terminateOnUpdate, updateTimeout, and updateToLatestImageVersion, these specific properties are not applicable when configuring AWS Batch Fargate compute environments. They primarily apply to EC2-based compute environments. Please refer to the official AWS Batch UpdateComputeEnvironment API documentation and User Guide for details on updating Fargate compute environments.

This addition will make the documentation consistent with the actual behavior and the official AWS Batch guides.

We welcome PRs!

[deftcx-aws]

Thank you, will follow the instruction and initiate a PR.

[deftcx-aws]

PR:#34022 I'd appreciate it if could look at it, thank you!

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