[Hadoop Wiki] Update of "GitAndHadoop" by SteveLoughran

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The "GitAndHadoop" page has been changed by SteveLoughran:
https://wiki.apache.org/hadoop/GitAndHadoop?action=diff&rev1=21&rev2=22

Comment:
fix HowToCommit link; change  stated size of git clone to not need updating for a while

  A lot of people use Git with Hadoop because they have their own patches to make to Hadoop, and Git helps them manage it.
  
   * GitHub provide some good lessons on git at [[http://learn.github.com]]
-  * Apache serves up read-only Git versions of their source at [[http://git.apache.org/]]. Committers can commit changes to writable Git repository. See HowToCommitWithGit
+  * Apache serves up read-only Git versions of their source at [[http://git.apache.org/]]. Committers can commit changes to writable Git repository. See HowToCommit
  
  This page tells you how to work with Git. See HowToContribute for instructions on building and testing Hadoop.
  <<TableOfContents(4)>>
@@ -35, +35 @@

  https://git-wip-us.apache.org/repos/asf/hadoop.git
  }}}
  
- The total download is well over 100MB, so the initial checkout process works best when the network is fast. Once downloaded, Git works offline -though you will need to perform your initial builds online so that the build tools can download dependencies.
+ The total download is a few hundred MB, so the initial checkout process works best when the network is fast. Once downloaded, Git works offline -though you will need to perform your initial builds online so that the build tools can download dependencies.
  
  == Grafts for complete project history ==