chore(cloudwatch): correct spelling error in alarm-base docstrings

[7empestx]

This PR fixes a spelling error in alarm-base docstrings for addAlarmAction, addInsufficientDataAction, and addOkAction where SnsAction was spelled SnsAcion.

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 9f8aa76
• Result: SUCCEEDED
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[colifran]

@7empestx Thanks for getting this corrected!

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).