DOCSP-11112 add tasks.max config property (#30)

* DOCSP-11112: add tasks.max setting

Author: Chris Cho

source/kafka-sink-properties.txt

@@ -222,6 +222,21 @@ data to sink to MongoDB. For an example configuration file, see
        | **Default**:  ``""``
        | **Accepted Values**: Accepted values specific to the overridden property
 
+   * - tasks.max
+     - int
+     - | The maximum number of tasks that should be created for this connector. The connector may create fewer tasks if it cannot handle the specified level of parallelism.
+
+       .. admonition:: Messages May Be Processed Out of Order For Values Greater Than 1
+          :class: important
+ 
+          If you specify a value greater than ``1``, the connector
+          enables parallel processing of the tasks. If your topic has
+          multiple partition logs (allows consumers to read from the
+          topic in parallel), messages may be processed out of order.
+
+       | **Default**: ``1``
+       | **Accepted Values**: a positive integer.
+
 .. _topic-specific-configuration:
 
 Topic-Specific Configuration Settings