Fix link check (#2544)

Author: trask

jmx-metrics/docs/target-systems/kafka-consumer.md

@@ -1,7 +1,7 @@
 # Kafka Consumer Metrics
 
 The JMX Metric Gatherer provides built in Kafka consumer metric gathering capabilities for versions v0.8.2.x and above.
-These metrics are sourced from Kafka's exposed JMX metrics for each instance: <https://kafka.apache.org/documentation/#monitoring>
+These metrics are sourced from Kafka's exposed JMX metrics for each instance: <https://kafka.apache.org/41/operations/monitoring/>
 
 ## Consumer Metrics
 

jmx-metrics/docs/target-systems/kafka-producer.md

@@ -1,7 +1,7 @@
 # Kafka Producer Metrics
 
 The JMX Metric Gatherer provides built in Kafka producer metric gathering capabilities for versions v0.8.2.x and above.
-These metrics are sourced from Kafka's exposed JMX metrics for each instance: <https://kafka.apache.org/documentation/#monitoring>
+These metrics are sourced from Kafka's exposed JMX metrics for each instance: <https://kafka.apache.org/41/operations/monitoring/>
 
 ## Producer Metrics
 

jmx-metrics/docs/target-systems/kafka.md

@@ -1,7 +1,7 @@
 # Kafka Metrics
 
 The JMX Metric Gatherer provides built in Kafka metric gathering capabilities for versions v0.8.2.x and above.
-These metrics are sourced from Kafka's exposed JMX metrics for each instance: <https://kafka.apache.org/documentation/#monitoring>
+These metrics are sourced from Kafka's exposed JMX metrics for each instance: <https://kafka.apache.org/41/operations/monitoring/>
 
 ## Broker Metrics