Claim about v1beta1/v1alpha2 support for gateway api is misleading

[jsoref]

website/content/docs/usage/gateway.md

Lines 26 to 27 in 1243d17

	🚧 cert-manager 1.14+ is tested with v1 Kubernetes Gateway API. It should also work
	with v1beta1 and v1alpha2 because of resource conversion, but has not been tested with it.

See:

• Gateway API CRDs exist, yet getting "the Gateway API CRDs do not seem to be present, but ExperimentalGatewayAPISupport is set to true. Please install the gateway-api CRDs" error message. cert-manager#6649