Package level Java doc is outdated.

[franzwong]

Describe the bug

The code example on the Java doc (Package com.lmax.disruptor) is outdated.

RingBuffer no longer has public constructor.

RingBuffer<ValueEvent> ringBuffer =
     new RingBuffer<ValueEvent>(ValueEvent.EVENT_FACTORY,
                                new SingleThreadedClaimStrategy(BUFFER_SIZE),
                                new SleepingWaitStrategy());

To Reproduce
N/A

Expected behavior
We either remove or update it.

Desktop (please complete the following information):
N/A

Additional context
None

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