[Pig Wiki] Update of "ExampleGenerator" by ShubhamChopra

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The following page has been changed by ShubhamChopra:
http://wiki.apache.org/pig/ExampleGenerator

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  Amy     bbc.com 20071205
  Fred    stanford.edu    20071206
  }}}
- A grunt session might look something like this (Note the use of alias while 
loading data. ExampleGenerator needs you to provide aliases) :
+ A grunt session might look something like this (Note the use of schemas while 
loading data. ExampleGenerator needs you to provide aliases) :
  {{{
  grunt> visits = load 'visits.txt' as (user, url, timestamp);
  grunt> recent_visits = filter visits by timestamp >= '20071201';