hook: breaking API change: OnThrottle => OnBrokerThrottle

This was meant to be a part of v0.8.0, I'm not sure how I missed it
considering I switched every other broker-specific hook to OnBroker.

pkg/kgo/broker.go

@@ -1273,7 +1273,7 @@ func (cxn *brokerCxn) handleResps() {
  }
  cxn.cl.cfg.hooks.each(func(h Hook) {
  if h, ok := h.(HookBrokerThrottle); ok {
- h.OnThrottle(cxn.b.meta, time.Duration(millis)*time.Millisecond, throttlesAfterResp)
+ h.OnBrokerThrottle(cxn.b.meta, time.Duration(millis)*time.Millisecond, throttlesAfterResp)
  }
  })
  }

pkg/kgo/hooks.go

@@ -146,17 +146,17 @@ type HookBrokerE2E interface {
 // HookBrokerThrottle is called after a response to a request is read
 // from a broker, and the response identifies throttling in effect.
 type HookBrokerThrottle interface {
- // OnThrottle is passed the broker metadata, the imposed throttling
- // interval, and whether the throttle was applied before Kafka
- // responded to them request or after.
+ // OnBrokerThrottle is passed the broker metadata, the imposed
+ // throttling interval, and whether the throttle was applied before
+ // Kafka responded to them request or after.
  //
  // For Kafka < 2.0.0, the throttle is applied before issuing a response.
  // For Kafka >= 2.0.0, the throttle is applied after issuing a response.
  //
  // If throttledAfterResponse is false, then Kafka already applied the
  // throttle. If it is true, the client internally will not send another
  // request until the throttle deadline has passed.
- OnThrottle(meta BrokerMetadata, throttleInterval time.Duration, throttledAfterResponse bool)
+ OnBrokerThrottle(meta BrokerMetadata, throttleInterval time.Duration, throttledAfterResponse bool)
 }
 
 // HookGroupManageError is called after every error that causes the client,