Apply PR feedback

Signed-off-by: Norwin Schnyder <[email protected]>

Author: snorwin

geps/gep-1897/index.md

@@ -214,7 +214,7 @@ configuration. CACertificateRefs is an implementation-specific slice of
 named object references, each containing a single cert. We originally proposed to follow the convention established by the
 [CertificateRefs field on Gateway](https://github.com/kubernetes-sigs/gateway-api/blob/18e79909f7310aafc625ba7c862dfcc67b385250/apis/v1beta1/gateway_types.go#L340)
 , but the CertificateRef requires both a tls.key and tls.crt and a certificate reference only requires the tls.crt.
-If the CertificateRef cannot be resolved or does not include a certificate (tls.crt), the BackendTLSPolicy is considered invalid.
+If any of the CACertificateRefs cannot be resolved or is misconfigured, the BackendTLSPolicy is considered invalid.
 
 WellKnownCACertificates is an optional enum that allows users to specify whether to use the set of CA certificates trusted by the
 Gateway (WellKnownCACertificates specified as "System"), or to use the existing CACertificateRefs (WellKnownCACertificates