docs: correct default log retention - #218

Description

Corrects the conflicting retention comment in the 0-bootstrap sample. The sample now states that Cloud Logging buckets use logging_bucket_retention, whose default is 365 days, instead of incorrectly describing a 30-day default.

Fixes #194

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Deployment & Compliance Impact

• Applicable Regimes:
  • US Region Restricted (e.g., Access Policy constraint)
  • FedRAMP Moderate
  • FedRAMP High
  • DoD IL4
  • DoD IL5
  • General / All
• NIST 800-53r5 Controls: None. This PR corrects a sample comment and does not modify control implementations.

Checklist

Code Quality & Reusability

• My code adheres to the Maximize Reusability principle. I have not redefined common elements and have reused existing base configurations and modules where possible.
• I have checked that no existing module or configuration in modules/ or fast/ can be leveraged for this change.
• My code follows the established naming conventions outlined in documentation/naming-convention.md.

Not applicable: no code, modules, configuration values, or resource names change.

Documentation

• I have updated the README.md of the modified module or blueprint.
• I have added/updated documentation for inputs (variables) and outputs.

The existing variable description and sample now consistently document the same default.

Security

• My change adheres to GCP security best practices and the principle of least privilege.
• I have ensured compliance with the targeted regime (FedRAMP Moderate, FedRAMP High, IL5, etc.).

Not applicable: this documentation correction does not change deployed resources or security behavior.

Testing

• I have tested my changes locally.
• I have included details of my testing in this PR.

Testing Performed

• Verified logging_bucket_retention defaults to 365 in the bootstrap variables
• Verified the log-export module receives that variable
• Ran git diff --check