Kafka Source Connector - fix updatelookup typo (#575)

Author: Chris Cho

source/connectors/kafka-source.txt

@@ -159,7 +159,7 @@ an example source connector configuration file, see
      - string
      - | Determines what to return for update operations when using a Change Stream. When set to 'updateLookup', the change stream for partial updates will include both a delta describing the changes to the document as well as a copy of the entire document that was changed from *some point in time* after the change occurred.
        | **Default**: ""
-       | **Accepted Values**: "" or ``default`` or ``updatelookup``
+       | **Accepted Values**: "" or ``default`` or ``updateLookup``
 
    * - poll.await.time.ms
      - long