cos_bucket_retention_maximum description lacks details

[vburckhardt]

Adjust description to give more details - eg: what is the unit of time used by this input (days?), and how it is used (link to cos doc as needed)

Affected modules

Terraform CLI and Terraform provider versions

• Terraform version:
• Provider version:

Terraform output

Debug output

Expected behavior

Actual behavior

Steps to reproduce (including links and screen captures)

1. Run terraform apply

Anything else

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