Docs: Update validation utility comments and docstrings

[leandrodamascena]

Why is this needed?

Update validation utility comments and docstrings to add support for mkdocstrings.

Which area does this relate to?

Automation

Solution

No response

Acknowledgment

• This request meets Powertools for AWS Lambda (Python) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Java, TypeScript, and .NET

[github-actions]

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