[8.13](backport #38706) [AWS] Fix rds field description aws.rds.cpu.total.pct

[mergify]

Proposed commit message

Based on the code where the RDS CPU metric is collected, this value is divided by 100: https://github.com/elastic/beats/blob/v8.10.2/x-pack/metricbeat/module/aws/cloudwatch/metadata/rds/rds.go#L40
Fixing the documentation to not say percentage in the field description.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

---

This is an automatic backport of pull request #38706 done by [Mergify](https://mergify.com).

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[mergify]

This pull request has not been merged yet. Could you please review and merge it @kaiyan-sheng? 🙏

[mergify]

This pull request has not been merged yet. Could you please review and merge it @kaiyan-sheng? 🙏

[mergify]

This pull request has not been merged yet. Could you please review and merge it @kaiyan-sheng? 🙏