documentation of DataWatcher state transition is misleading regarding auto 
watch reset on reconnect

                 Key: ZOOKEEPER-253
             Project: Zookeeper
          Issue Type: Bug
          Components: documentation
    Affects Versions: 3.0.1, 3.0.0
            Reporter: Patrick Hunt
            Assignee: Patrick Hunt
            Priority: Minor
             Fix For: 3.1.0

the example code has

           case SyncConnected:
               // Everything is happy. Lets kick things off
               // again by checking the existence of the znode
               zk.exists(znode, true, this, null);

this is misleading - it should indicate that the watches are automatically 
reset and therefor no call to exists is necessary

also fix this in the same doc (looks like its old detail, no longer valid), 
indicate that autoreset will happen on reconnect.

If the client-side ZooKeeper libraries can reestablish the communication 
channel to ZooKeeper, DataMonitor simply kicks everything off again with the 
call to ZooKeeper.exists(). If it gets an event for a znode, it calls 
ZooKeeper.exists() to find out what has changed. 

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