[AWS::BedrockAgentCore::GatewayTarget] - [Docs] - SchemaDefinition Items missing description

### Name of the resource

Other

### Resource name

AWS::BedrockAgentCore::GatewayTarget

### Reference Link

https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-properties-bedrockagentcore-gatewaytarget-schemadefinition.html

### Details

currently states

> Items
> 
>     Property description not available.