[Pig Wiki] Trivial Update of "HowToContribute" by CorinneC

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http://wiki.apache.org/pig/HowToContribute

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  First of all, you need the Pig source code.
  
- Get the source code on your local drive using [http://incubator.apache.org/pig/version_control.html SVN]. Most development is done on the "trunk":
+ Get the source code on your local drive using [http://hadoop.apache.org/pig/version_control.html SVN]. Most development is done on the "trunk":
  
- svn checkout http://svn.apache.org/repos/asf/incubator/pig/trunk/ 
+ svn checkout http://svn.apache.org/repos/asf/hadoop/pig/trunk/ 
  
  ##If you prefer to use Eclipse for development, there are instructions for setting up SVN access from within Eclipse at EclipseEnvironment.
  
  == Making Changes ==
  
- Before you start, send a message to the [http://incubator.apache.org/pig/mailing_lists.html Pig developer mailing list], or file a bug report in
+ Before you start, send a message to the [http://hadoop.apache.org/pig/mailing_lists.html Pig developer mailing list], or file a bug report in
  [http://issues.apache.org/jira/browse/PIG Jira]. Describe your proposed changes and check that they fit in with what others are doing and have planned
  for the project. Be patient, it may take folks a while to understand your requirements.
  
@@ -164, +164 @@

  
  == Stay involved ==
  
- Contributors should join the [http://incubator.apache.org/pig/mailing_lists.html Pig mailing lists]. In particular, the commit list (to see changes as they are made),
+ Contributors should join the [http://hadoop.apache.org/pig/mailing_lists.html Pig mailing lists]. In particular, the commit list (to see changes as they are made),
  the dev list (to join discussions of changes) and the user list (to help others).
  
  See Also