[FLINK-4500][docs] Update cassandra documentation regarding data loss

As of FLINK-4500 the Cassandra connector will wait for pending updates to finish upon checkpoint. This closes apache#5002.
mpdn · Nov 14, 2017 · fcbfbb9 · fcbfbb9
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diff --git a/docs/dev/connectors/cassandra.md b/docs/dev/connectors/cassandra.md
@@ -101,8 +101,6 @@ Note that that enabling this feature will have an adverse impact on latency.
 ### Checkpointing and Fault Tolerance
 With checkpointing enabled, Cassandra Sink guarantees at-least-once delivery of action requests to C* instance.
 
-<p style="border-radius: 5px; padding: 5px" class="bg-danger"><b>Note</b>: However, current Cassandra Sink implementation does not flush the pending mutations before the checkpoint was triggered. Thus, some in-flight mutations might not be replayed when the job recovered. </p>
-
 More details on [checkpoints docs]({{ site.baseurl }}/dev/stream/state/checkpointing.html) and [fault tolerance guarantee docs]({{ site.baseurl }}/dev/connectors/guarantees.html)
 
 ## Examples