[Nutch Wiki] Trivial Update of "FAQ" by GalNitzan

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The following page has been changed by GalNitzan:
http://wiki.apache.org/nutch/FAQ

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  To solve this problem, add the following java param to the java instantiation 
in bin/nutch:
  
  JAVA_IPV4=-Djava.net.preferIPv4Stack=true
+ 
  # run it
  exec "$JAVA" $JAVA_HEAP_MAX $NUTCH_OPTS $JAVA_IPV4 -classpath "$CLASSPATH" 
$CLASS "$@"