Fix code snippets. Ensure yaml and json are in sync

[debbm]

Description

Fixed issue where content-type header was generated properly for all code snippets. Minor update to copy some description text from IAM.json back to IAM.yaml.

Motivation and Context

Customer reported missing content-type header in some of the code snippets.

How Has This Been Tested?

Tested locally

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist

• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes if appropriate.
• [ ] All new and existing tests passed.

[github-actions[bot]]

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