Update argument definitions for `point_in_time_recovery_enabled` and `transaction_log_retention_days`

[rebecca-pete]

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Description

Please update argument definitions for point_in_time_recovery_enabled and transaction_log_retention_days.

Please review recommended changes: #20903

New or Affected Resource(s)

• google_sql_database_instance
• https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/sql_database_instance#argument-reference

Potential Terraform Configuration

References

Please review #20903

b/391379688