[Hadoop Wiki] Update of "HowToContribute" by GaryMurry

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The following page has been changed by GaryMurry:
http://wiki.apache.org/hadoop/HowToContribute

The comment on the change is:
Just changing URL references from core to common. No change to mailing list name

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- = How to Contribute to Hadoop Core =
+ = How to Contribute to Hadoop Common =
  
- This page describes the mechanics of ''how'' to contribute software to Hadoop Core.  For ideas about ''what'' you might contribute, please see the ProjectSuggestions page.
+ This page describes the mechanics of ''how'' to contribute software to Hadoop Common.  For ideas about ''what'' you might contribute, please see the ProjectSuggestions page.
  
  === Getting the source code ===
  
  First of all, you need the Hadoop source code.[[BR]]
  
- Get the source code on your local drive using [http://hadoop.apache.org/core/version_control.html SVN].  Most development is done on the "trunk":
+ Get the source code on your local drive using [http://hadoop.apache.org/common/version_control.html SVN].  Most development is done on the "trunk":
  
  {{{
- svn checkout http://svn.apache.org/repos/asf/hadoop/core/trunk/ hadoop-core-trunk
+ svn checkout http://svn.apache.org/repos/asf/hadoop/common/trunk/ hadoop-common-trunk
  }}}
  
- You may also want to develop against a specific release.  To do so, visit [http://svn.apache.org/repos/asf/hadoop/core/tags/] and find the release that you are interested in developing against.  To checkout this release, run:
+ You may also want to develop against a specific release.  To do so, visit [http://svn.apache.org/repos/asf/hadoop/common/tags/] and find the release that you are interested in developing against.  To checkout this release, run:
  
  {{{
- svn checkout http://svn.apache.org/repos/asf/hadoop/core/tags/release-X.Y.Z/ hadoop-core-X.Y.Z
+ svn checkout http://svn.apache.org/repos/asf/hadoop/common/tags/release-X.Y.Z/ hadoop-common-X.Y.Z
  }}}
  
  If you prefer to use Eclipse for development, there are instructions for setting up SVN access from within Eclipse at EclipseEnvironment.
@@ -57, +57 @@

  Please make sure that all unit tests succeed before constructing your patch and that no new javac compiler warnings are introduced by your patch.
  
  {{{
- > cd hadoop-core-trunk
+ > cd hadoop-common-trunk
  > ant -Djavac.args="-Xlint -Xmaxwarns 1000" clean test tar
  }}}
  After a while, if you see