(DOC) fix version number
fix version number when default waitstrategy is garbage-free
will result in temporary objects being created during steady-state logging.
</p>
<p>
- <b>Note 2:</b> as of version 2.17.3, the default Async Logger wait strategy used by Log4j
+ <b>Note 2:</b> as of version 2.18.0, the default Async Logger wait strategy used by Log4j
(Timeout) is garbage-free. Some of the wait strategies included in LMAX disruptor 3.4.4,
especially <tt>TimeoutBlockingWaitStrategy</tt> and <tt>BlockingWaitStrategy</tt> (Block)
are not garbage-free since they
