Add documentation to AWS MQ engine type validation rules

[Copilot]

The enum list in aws_mq_broker_invalid_engine_type.go needed verification and documentation of supported engine types.

Changes

• Added AWS API reference comments to both aws_mq_broker_invalid_engine_type.go and aws_mq_configuration_invalid_engine_type.go
• Documented that Terraform uses mixed case (ActiveMQ, RabbitMQ) while AWS API uses uppercase (ACTIVEMQ, RABBITMQ)
• Verified enum list is current against aws-sdk-ruby (Oct 31, 2025) and AWS documentation

// https://docs.aws.amazon.com/amazon-mq/latest/api-reference/broker-engine-types.html
// Terraform uses mixed case: ActiveMQ, RabbitMQ (AWS API uses uppercase: ACTIVEMQ, RABBITMQ)
enum: []string{
    "ActiveMQ",
    "RabbitMQ",
},

No new engine types have been added to AWS MQ - ActiveMQ and RabbitMQ remain the only supported broker engines.

Original prompt

Please update enum list in rules/aws_mq_broker_invalid_engine_type.go

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