[Doc]--Update doc for precise topic publish rate limiting on Broker (a…

…pache#7239)

# Motivation

The [PR](apache#7078) introduce precise topic publish rate limiting on broker. But the doc is not updated accordingly.


### Modifications

Update the Pulsar doc: Reference > Pulsar configuration > broker

site2/docs/reference-configuration.md

@@ -266,6 +266,7 @@ subscriptionExpirationTimeMinutes | How long to delete inactive subscriptions fr
 |s3ManagedLedgerOffloadRoleSessionName| For Amazon S3 ledger offload, provide a role session name when using a role |pulsar-s3-offload|
 | acknowledgmentAtBatchIndexLevelEnabled | Enable or disable the batch index acknowledgement. | false |
 | maxMessageSize | Set the maximum size of a message. | 5 MB |
+| preciseTopicPublishRateLimiterEnable | Enable precise topic publish rate limiting. | false |