docs: Update suspended_processes available values with InstanceRefresh

[sirhazi]

Description

• Updated README and code comment to reflect valid values of suspended_processes, as per the AWS docs: https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-suspend-resume-processes.html

Motivation and Context

• Correct documentation to reflect the actual values.

Breaking Changes

• No

How Has This Been Tested?

• [ ] I have updated at least one of the examples/* to demonstrate and validate my change(s)
• [ ] I have tested and validated these changes using one or more of the provided examples/* projects
• [ ] I have executed pre-commit run -a on my pull request

[antonbabenko]

This PR is included in version 6.5.2 :tada:

[github-actions[bot]]

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