Added example output

Author: Ed Costello

source/reference/command/writeBacksQueued.txt

@@ -31,4 +31,31 @@ writeBacksQueued (internal)
 
       The minutes since the last call.
 
-   .. slave-ok, admin-only
+Examples
+--------
+
+.. code-block:: javascript
+
+      > db.runCommand({writeBacksQueued: 1})
+      {
+      	"hasOpsQueued" : true,
+      	"totalOpsQueued" : 7,
+      	"queues" : {
+      		"50a514204a0f431ff1944089" : { "n" : 0, "minutesSinceLastCall" : 1 },
+      		"50a854a2c302ba1c5aeaaf59" : { "n" : 0, "minutesSinceLastCall" : 0 },
+      		"50a854b65bbdacd51df98cb6" : { "n" : 0, "minutesSinceLastCall" : 0 },
+      		"50a854c6ff03535c6effb72e" : { "n" : 0, "minutesSinceLastCall" : 0 },
+      		"50a8553566232f70121071b3" : { "n" : 0, "minutesSinceLastCall" : 4 },
+      		"50aa4711bd3c78d62453017e" : { "n" : 0, "minutesSinceLastCall" : 0 },
+      		"50ac0df0293da708be675123" : { "n" : 0, "minutesSinceLastCall" : 1 }
+      	},
+      	"ok" : 1
+      }
+
+
+.. slave-ok, admin-only
+
+.. The queue ids are BSON objectids, they correspond to the
+   mongos that has talked to this shard. This is derived from the
+   "serverID" field of the setShardVersion command the mongos
+   sends to the shard