[Lucene-java Wiki] Trivial Update of "AvailableLockFactories" by SanneGrinovero

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The "AvailableLockFactories" page has been changed by SanneGrinovero.
http://wiki.apache.org/lucene-java/AvailableLockFactories

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New page:
When applying changes to an index the Index``Writer needs to acquire an exclusive lock on the Directory.

While both F``S``Directory and R``A``M``Directory have sensible defaults you might want to consider an alternative for finetuning of performance, or because you are storing the index on some multiple-node shared resource having issues with file based locking.

/!\ :TODO: /!\