feat: add support for updated custom runtime base image tags and documentation examples

[ANU5565]

Description

As the AWS Lambda ecosystem evolves, developers frequently look for updated base image options, optimized runtime layer configurations, and clearer documentation examples for custom architectures.

This issue proposes adding enhanced configuration examples and verification steps for custom runtimes within the repository's documentation guides to streamline deployment workflows.

Proposed Changes / Features

• Update documentation examples for modern container workflows.
• Provide clear instructions for verifying base image tag compatibility.
• Add troubleshooting notes for common build-time edge cases.

Environment & Context

• Repository: aws/aws-lambda-base-images
• Component: Dockerfiles / Documentation Guides