Remove Kafka broker configuration documentation

Kafka broker code is a separate plugin, clean up multi-site
documentation to reflect currently available settings.

Feature: Issue 11599
Change-Id: I8e2cff4371d784933cfc330ac34008e555cba324

src/main/resources/Documentation/config.md

diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index b44d1dd..18f8d0b 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -12,25 +12,6 @@
 ## Sample configuration.
 
 ```
-[kafka]
-  bootstrapServers = kafka-1:9092,kafka-2:9092,kafka-3:9092
-
-  indexEventTopic = gerrit_index
-  streamEventTopic = gerrit_stream
-  cacheEventTopic = gerrit_cache_eviction
-  projectListEventTopic = gerrit_project_list
-
-[kafka "publisher"]
-  KafkaProp-compressionType = none
-  KafkaProp-deliveryTimeoutMs = 60000
-
-[kafka "subscriber"]
-  pollingIntervalMs = 1000
-
-  KafkaProp-enableAutoCommit = true
-  KafkaProp-autoCommitIntervalMs = 1000
-  KafkaProp-autoCommitIntervalMs = 5000
-
 [ref-database "zookeeper"]
   connectString = "localhost:2181"
   rootNode = "/gerrit/multi-site"
@@ -93,31 +74,22 @@
 :   The time interval in milliseconds between subsequent auto-retries.
     Defaults to 30000 (30 seconds).
 
-```kafka.bootstrapServers```
-:	  List of Kafka broker hosts (host:port) to use for publishing events to the message
-    broker
-
-```kafka.indexEventTopic```
-:   Name of the Kafka topic to use for publishing indexing events
+```broker.indexEventTopic```
+:   Name of the topic to use for publishing indexing events
     Defaults to GERRIT.EVENT.INDEX
 
-```kafka.streamEventTopic```
-:   Name of the Kafka topic to use for publishing stream events
+```broker.streamEventTopic```
+:   Name of the topic to use for publishing stream events
     Defaults to GERRIT.EVENT.STREAM
 
-```kafka.cacheEventTopic```
-:   Name of the Kafka topic to use for publishing cache eviction events
+```broker.cacheEventTopic```
+:   Name of the topic to use for publishing cache eviction events
     Defaults to GERRIT.EVENT.CACHE
 
-```kafka.projectListEventTopic```
-:   Name of the Kafka topic to use for publishing cache eviction events
+```broker.projectListEventTopic```
+:   Name of the topic to use for publishing cache eviction events
     Defaults to GERRIT.EVENT.PROJECT.LIST
 
-```kafka.subscriber.pollingIntervalMs```
-:   Polling interval in milliseconds for checking incoming events
-
-    Defaults: 1000
-
 ```ref-database.enabled```
 :   Enable the use of a shared ref-database
     Defaults: true
@@ -213,24 +185,4 @@
     from Zookeeper, applying the git local changes and writing the new objectId
     into Zookeeper
 
-    Defaults: 1000
-
-#### Custom kafka properties:
-
-In addition to the above settings, custom Kafka properties can be explicitly set
-for `publisher` and `subscriber`.
-In order to be acknowledged, these properties need to be prefixed with the
-`KafkaProp-` prefix and be formatted using camel case, as follows: `KafkaProp-yourPropertyValue`
-
-For example, if you want to set the `auto.commit.interval.ms` property for
-consumers, you need to configure this property as `KafkaProp-autoCommitIntervalMs`.
-
-The complete list of available settings can be found directly in the kafka website:
-
-* **Publisher**: https://kafka.apache.org/documentation/#producerconfigs
-* **Subscriber**: https://kafka.apache.org/documentation/#consumerconfigs
-
-#### Notes:
-* From version 3.0 publisher and subscribers cannot be disabled independently anymore.
-* From version 3.0 disabling the management of certain cache invalidations or re-indexing
-is not available anymore.
\ No newline at end of file
+    Defaults: 1000
\ No newline at end of file