[Spamassassin Wiki] Update of "GeneticAlgorithm" by JustinMason

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The following page has been changed by JustinMason:
http://wiki.apache.org/spamassassin/GeneticAlgorithm

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  SpamAssassin's scores were assigned using a genetic algorithm in versions up to 3.0.0. A good intro on genetic algorithms can be found here: http://lancet.mit.edu/~mbwall/presentations/IntroToGAs/
  
- Versions since 3.0.0 are now using a perceptron, written by Henry Stern, to perform the same task (but a lot faster); his program 'implements the "Stochastic [http://grin-optics.org Gradient] Descent" method of
+ Versions since 3.0.0 are now using a perceptron, written by Henry Stern, to perform the same task (but a lot faster); his program 'implements the "Stochastic Gradient Descent" method of
  training a neural network.  It uses a single perceptron with a logsig activation function and maps the weights to SpamAssassin score space.'  See the file "[http://www.spamassassin.org/full/3.0.x/dist/masses/README.perceptron masses/README.perceptron]" for more details.
  
  See RescoringProcess for further details.