Fix Godoc for BackendTLSPolicyValidation struct for Hostname field (#3923)

* Fix Godoc for BackendTLSPolicyValidation struct for Hostname field

* Run make generate

Author: mayuka-c

apis/v1alpha3/backendtlspolicy_types.go

@@ -152,8 +152,6 @@ type BackendTLSPolicyValidation struct {
 	//
 	// 1. Hostname MUST be used as the SNI to connect to the backend (RFC 6066).
 	// 2. Hostname MUST be used for authentication and MUST match the certificate served by the matching backend, unless SubjectAltNames is specified.
-	//    authentication and MUST match the certificate served by the matching
-	//    backend.
 	//
 	// Support: Core
 	Hostname v1.PreciseHostname `json:"hostname"`