[Jclouds Wiki] Update of "How to Contribute" by IgnasiBarrera

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The "How to Contribute" page has been changed by IgnasiBarrera:
https://wiki.apache.org/jclouds/How%20to%20Contribute?action=diff&rev1=12&rev2=13

  
  === 2. Create a pull request in GitHub ===
  
- Next, you'll want to create a pull request (PR) in !GitHub for the change you're interested in making. The comment section of the PR must contain a link to the JIRA issue (if it has one). Please also reference the issue [[https://git-wip-us.apache.org/repos/asf?p=incubator-jclouds.git;a=commit;h=ff3405c967b9fd6701fa39c6bb57d0308dd6e1e6|in the commit message]]. If you need the commit backported to one of the release branches (e.g. 1.6.x), make a note about that in the comment too and set the Affects Version/s of the issue accordingly. 
+ Next, you'll want to create a pull request (PR) in !GitHub for the change you're interested in making. The comment section of the PR must contain a link to the JIRA issue (if it has one). Please also reference the issue [[https://git-wip-us.apache.org/repos/asf?p=jclouds.git;a=commit;h=ff3405c967b9fd6701fa39c6bb57d0308dd6e1e6|in the commit message]], and make sure it properly describes the changes that have been made and their purpose ([[http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html|here]] are some guidelines). If you need the commit backported to one of the release branches (e.g. 1.6.x), make a note about that in the comment too and set the Affects Version/s of the issue accordingly. 
  
  Some good references for working with !GitHub are below.  We ask that you keep your change rebased to master as much as possible, and we will ask you to rebase again if master has moved before accepting your patch.
   * [[https://help.github.com/articles/set-up-git|Setting Up Git with GitHub]]