Fix producerconfigs documentation link (#2226)

Author: MandarJKulkarni

kafka/producer/kafka.py

@@ -284,7 +284,7 @@ class KafkaProducer(object):
 
     Note:
         Configuration parameters are described in more detail at
-        https://kafka.apache.org/0100/configuration.html#producerconfigs
+        https://kafka.apache.org/0100/documentation/#producerconfigs
     """
     DEFAULT_CONFIG = {
         'bootstrap_servers': 'localhost',