Add comment explaining requestTimeoutSec - 1 in relay handler

Author: nadahalli

deployment/cre/jobs/pkg/gateway_job.go

@@ -456,6 +456,8 @@ func newDefaultConfidentialRelayHandler(requestTimeoutSec int) handler {
 		Name:        GatewayHandlerTypeConfidentialRelay,
 		ServiceName: ServiceNameConfidential,
 		Config: confidentialRelayHandlerConfig{
+			// must be lower than the overall gateway request timeout,
+			// so we allow for the response to be sent back.
 			RequestTimeoutSec: requestTimeoutSec - 1,
 			NodeRateLimiter: nodeRateLimiterConfig{
 				GlobalBurst:    10,