Docs - Add examples for aws secrets manager

[ricardojdsilva87]

Description

Addition of some examples of usage for cross account stored secrets on AWS Secrets Manager.
The ARN of the secret can be used in this case. Permissions on IAM roles and KMS keys are needed to configure the cross account access, links added

Fixes:
Existent examples were vault examples:
#316

Checklist

Please make sure that your PR fulfills the following requirements:

• Reviewed the guidelines for contributing to this repository
• The commit message follows the Conventional Commits Guidelines.
• Tests for the changes have been updated
• Docs have been added / updated
• Optional. My organization is added to USERS.md.

Type of Change

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

[werne2j]

Thanks!