[Hadoop Wiki] Update of "HowToContribute" by EliCollins

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The "HowToContribute" page has been changed by EliCollins:
http://wiki.apache.org/hadoop/HowToContribute?action=diff&rev1=59&rev2=60

  
  This way other developers can preview your change by running the script and then applying the patch.
  
+ ==== Naming your patch ====
+ 
+ Patches for trunk should be named '''jira-xyz.patch''', eg hdfs-123.patch. Patches for a specific branch should be named '''jira-xyz-branch.patch''', eg hdfs-123-branch-0.20-security.
+ 
+ It's OK to upload a patch to Jira with the same name as an existing patch, Jira will just make the previous patches grey. They're still listed, sorted by date. If you select the "Activity>All" tab then the different versions are linked in the comment stream, providing context. The branch name allows the pre-commit tests to run against the correct branch (HADOOP-7435).
+ 
+ 
  ==== Testing your patch ====
  Before submitting your patch, you are encouraged to run the same tools that the automated Jenkins patch test system will run on your patch.  This enables you to fix problems with your patch before you submit it. The {{{dev-support/test-patch.sh}}} script in the trunk directory will run your patch through the same checks that Hudson currently does ''except'' for executing the unit tests.