06-distributed-computing_jobs_by_key.rst: include table name in example

Author: Chris Turner

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

@@ -3,17 +3,18 @@ This can be done by using `dj.key_hash` to convert the key as follows:
 
 .. code-block:: python
 
-    In [4]: schema.jobs & {'key_hash' : dj.key_hash({'id': 2})}                
-    Out[4]: 
+    In [4]: jk = {'table_name': '__job_results', 'key_hash' : dj.key_hash({'id': 2})}
+    In [5]: schema.jobs & jk
+    Out[5]: 
     *table_name    *key_hash      status     key        error_message  error_stac user           host      pid        connection_id  timestamp     
     +------------+ +------------+ +--------+ +--------+ +------------+ +--------+ +------------+ +-------+ +--------+ +------------+ +------------+
     __job_results  c81e728d9d4c2f error      =BLOB=     KeyboardInterr =BLOB=     datajoint@localhost  localhost     15571     59             2017-09-04 14:
      (Total: 1)
     
-    In [5]: (schema.jobs & {'key_hash' : dj.key_hash({'id': 2})}).delete()     
+    In [6]: (schema.jobs & jk).delete()     
     
-    In [6]: schema.jobs & {'key_hash' : dj.key_hash({'id': 2})}                
-    Out[6]: 
+    In [7]: schema.jobs & jk
+    Out[7]: 
     *table_name    *key_hash    status     key        error_message  error_stac user     host     pid     connection_id  timestamp    
     +------------+ +----------+ +--------+ +--------+ +------------+ +--------+ +------+ +------+ +-----+ +------------+ +-----------+