[TEST] fix documentation checking tests to account for possible

pending tasks in the cluster state

docs/reference/getting-started.asciidoc

@@ -216,6 +216,7 @@ And the response:
 epoch      timestamp cluster       status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
 1475247709 17:01:49  elasticsearch green           1         1      0   0    0    0        0             0                  -                100.0%
 --------------------------------------------------
+// TESTRESPONSE[s/0             0/0             [01]/]
 // TESTRESPONSE[s/1475247709 17:01:49  elasticsearch/\\d+ \\d+:\\d+:\\d+ docs_integTest/ _cat]
 
 We can see that our cluster named "elasticsearch" is up with a green status.