[Doc] Fixed autoscaling doc

[gangmuk]

Pull Request Description

[Please provide a clear and concise description of your changes here]

Fixed wrong indentations in autoscaling.rst doc and sample yaml files

Fixed minor typos in autoscaling.rst

Related Issues

Resolves: #[Insert issue number(s)]

Important: Before submitting, please complete the description above and review the checklist below.

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• [Bug]: Corrections to existing functionality
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[Jeffwan]

/lgtm