[Cassandra Wiki] Update of "FAQ" by RalphGoers

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The "FAQ" page has been changed by RalphGoers:
http://wiki.apache.org/cassandra/FAQ?action=diff&rev1=137&rev2=138

  == Why is it so hard to work with TimeUUIDType in Java? ==
  TimeUUID's are difficult to use from java clients because java.util.UUID does not support generating version 1 (time-based) UUIDs.  Here is one way to work with them and Cassandra:
  
- Use the UUID generator from: http://johannburkard.de/software/uuid/
+ Use the UUID generator from: http://johannburkard.de/software/uuid/. Note that while a Type 1 UUID uses a granularity of 100 ns this UUID generator only uses milliseconds. Even with 100 ns granularity, with a Type 1 UUID it is still possible to get a duplicate UUID in a multi-threaded application running on a processor with muliple CPUs unless the clock sequence is properly incremented, which this UUID does not do (in this implementation the clock sequence is a random number generated when the class is loaded).
  
  Below are three methods that are quite useful in working with the uuids as they come in and out of Cassandra.