docs(changelog): move aws-lambda entry to proper place

[zwing99]

Fix Changelog with addresses #13203

Summary

Checklist

• The Pull Request has tests
• A changelog file has been created under changelog/unreleased/kong or skip-changelog label added on PR if changelog is unnecessary. README.md
• There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

Issue reference

Fix #[issue number]

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[jschmid1]

@Guaris Do we re-render the changelog from this file?