[Jclouds Wiki] Update of "Committers Guide" by IgnasiBarrera

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The "Committers Guide" page has been changed by IgnasiBarrera:
https://wiki.apache.org/jclouds/Committers%20Guide?action=diff&rev1=11&rev2=12

Comment:
Improved the remote fetch

     a. Alternatively, you can configure a ''github'' remote to also fetch the pull requests, and checkout them as follows (for a complete guide refer to [[https://help.github.com/articles/checking-out-pull-requests-locally|the GitHub howto]]):
     {{{
     $ git remote add github git@github.com:jclouds/jclouds.git
+    $ git config --local --add remote.github.fetch '+refs/pull/*/head:refs/remotes/github/pr/*'
-    $ vim .git/config
- 
-    # Edit the 'github' remote and add the additional 'fetch' line as follows
-    [remote "github"]
- 	url = git@github.com:jclouds/jclouds.git
-         fetch = +refs/heads/*:refs/remotes/github/*
-         fetch = +refs/pull/*/head:refs/remotes/github/pr/*
  
     # Now when fetching you will see all the pull requests (you can checkout them with "git checkout github/pr/99"):
     $ git fetch github