docs-parts: document kill order_by arg

Author: Chris Turner

docs-parts/computation/06-distributed-computing_kill_order_by.rst

@@ -0,0 +1,14 @@
+
+For example, to sort the output by hostname in descending order:
+
+.. code-block:: text
+
+    In [3]: dj.kill(None, None, 'host desc')
+    Out[3]:
+      ID USER         HOST          STATE         TIME    INFO
+    +--+ +----------+ +-----------+ +-----------+ +-----+
+      33 chris        localhost:54840                 1261  None
+      17 chris        localhost:54587                 3246  None
+       4 event_scheduler localhost    Waiting on empty queue  187180  None
+    process to kill or "q" to quit > q
+