Incorrect KubernetesContainerSpec reference in docs

[sqaisar]

Description

The generated documentation links to an incorrect API spec for KubernetesContainerSpec.

This type is referenced in GatewayConfig, and the generated docs link it to the wrong API reference.

Currently, the docs point to the Envoy AI Gateway API reference:
https://aigateway.envoyproxy.io/docs/api/#kubernetescontainerspec
it's being created by this https://github.com/envoyproxy/ai-gateway/blob/main/api/v1alpha1/gateway_config.go#L67

However, this type originates from Envoy Gateway extension types, and the correct reference should be:
https://gateway.envoyproxy.io/docs/api/extension_types/#kubernetescontainerspec

The documentation should link to the Envoy Gateway extension API instead of the Envoy AI Gateway API.

Repro steps

1. Open the generated documentation.
2. Navigate to GatewayConfig.
3. Locate the KubernetesContainerSpec reference.
4. Click the API spec link.
5. Observe that it redirects to the Envoy AI Gateway docs instead of Envoy Gateway extension types.

Environment

• Gateway: Envoy AI Gateway
• Docs source: Auto-generated API documentation
• Envoy Gateway version: N/A (documentation/linking issue)

Logs

N/A (documentation issue, no runtime logs involved)