Update link to kafka docs

Now that the old zookeeper consumer has been completely deprecated/removed, these are no longer the "new consumer configs" but rather simply the "consumer configs"

Author: jeffwidman

kafka/consumer/group.py

@@ -245,7 +245,7 @@ class KafkaConsumer(six.Iterator):
 
     Note:
         Configuration parameters are described in more detail at
-        https://kafka.apache.org/documentation/#newconsumerconfigs
+        https://kafka.apache.org/documentation/#consumerconfigs
     """
     DEFAULT_CONFIG = {
         'bootstrap_servers': 'localhost',