RFR: 8058550: Clarify that TimerTasks are not reusable

[roger riggs]

Hi Martin,

I'm not sure why the @see Timer is deleted.  The added link is useful 
but not a substitute.
Much of the behavior is defined in Timer.

Roger

On 9/18/2014 1:52 PM, Martin Buchholz wrote:
> Hi Chris,
>
> I'd like you to do a code review.
>
> http://cr.openjdk.java.net/~martin/webrevs/openjdk9/TimerTask-clarification/
> https://bugs.openjdk.java.net/browse/JDK-8058550